1,000,000,000

1,000,000,000 (one billion, short scale; one thousand million or one milliard, one yard,^[1] long scale) is the natural number following 999,999,999 and preceding 1,000,000,001. With a number, "billion" can be abbreviated as b, bil or bn.^[2]^[3]

See also: Orders of magnitude (numbers) and Long and short scales

1000000000

One billion (short scale)
One thousand million, or one milliard (long scale)

One billionth (short scale)

2⁹
5⁹

${\stackrel {\iota }{\mathrm {M} }}$

111011100110101100101000000000₂

2120200200021010001₃

243121245344₆

7346545000₈

23AA93854₁₂

3B9ACA00₁₆

In standard form, it is written as 1 × 10⁹. The metric prefix giga indicates 1,000,000,000 times the base unit. Its symbol is G.

One billion years may be called an eon in astronomy or geology.

Previously in British English (but not in American English), the word "billion" referred exclusively to a million millions (1,000,000,000,000). However, this is not common anymore, and the word has been used to mean one thousand million (1,000,000,000) for several decades.^[4]

The term milliard could also be used to refer to 1,000,000,000; whereas "milliard" is rarely used in English,^[5] variations on this name often appear in other languages.

In the South Asian numbering system, it is known as 100 crore or 1 arab.

1,000,000,000 is also the cube of 1000.

10⁹ seconds (1 gigasecond) equal 11,574 days, 1 hour, 46 minutes and 40 seconds (approximately 31.7 years, or 31 years, 8 months, 8 days).

About 10⁹ minutes ago, the was flourishing and Christianity was emerging. (10⁹ minutes is roughly 1,901 years.)

Roman Empire

About 10⁹ hours ago, modern human beings and their ancestors were living in the (more precisely, the Middle Paleolithic). (10⁹ hours is roughly 114,080 years.)

Stone Age

About 10⁹ days ago, , an ape-like creature related to an ancestor of modern humans, roamed the African savannas. (10⁹ days is roughly 2.738 million years.)

Australopithecus

About 10⁹ months ago, walked the Earth during the late Cretaceous. (10⁹ months is roughly 83.3 million years.)

dinosaurs

About 10⁹ years—a —ago, the first multicellular eukaryotes appeared on Earth.

gigaannus

About 10⁹ decades ago, the of the Milky Way started to form. (10⁹ decades is exactly 10 billion years.)

thin disk

The is thought to be about 13.8 × 10⁹ years old.^[6]

universe

1,000,000,007 : smallest with 10 digits.^[10]

prime number

1,000,006,281 : smallest with 10 digits and the 44,721st triangular number.

triangular number

1,000,014,129 = 31623², the smallest ten-digit square.

1,003,003,001 = 1001³, palindromic cube

1,023,456,789 : smallest pandigital number in decimal.

[11]

1,026,753,849 = 32043², the smallest pandigital in base 10.

square

1,069,863,695 = number of square (0,1)-matrices without zero rows and with exactly 9 entries equal to 1

[12]

1,073,741,824 = 32768² = 1024³ = 64⁵ = 32⁶ = 8¹⁰ = 4¹⁵ = 2³⁰

1,073,742,724 :

Leyland number

1,073,792,449 : Leyland number

1,093,104,961 = number of (unordered, unlabeled) rooted trimmed trees with 28 nodes

[13]

1,104,891,746 = number of with 12 unlabeled elements^[14]

partially ordered set

1,111,111,111 : , also a special number relating to the passing of Unix time.

repunit

1,129,760,415 = 23rd .^[15]

Motzkin number

1,134,903,170 = 45th .

Fibonacci number

1,139,733,677 : number k such that the sum of the squares of the first k primes is divisible by k.

[16]

1,160,290,625 = 65⁵

1,162,261,467 = 3¹⁹

1,162,268,326 : Leyland number

1,166,732,814 = number of signed trees with 17 nodes

[17]

1,173,741,824 : Leyland number

1,220,703,125 = 5¹³

1,221,074,418 : Leyland number

1,232,922,769 : .

Centered hexagonal number

1,234,567,890 : pandigital number with the digits in order.

1,252,332,576 = 66⁵

1,280,000,000 = 20⁷

1,291,467,969 = 35937² = 1089³ = 33⁶

1,311,738,121 : 25th .^[18]

Pell number

1,350,125,107 = 67⁵

1,382,958,545 : 15th .^[19]

Bell number

1,392,251,012 : number of secondary structures of RNA molecules with 27 nucleotides

[20]

1,405,695,061 : Markov prime

1,406,818,759 : 30th .^[21]

Wedderburn–Etherington number

1,421,542,641 : logarithmic number.

[22]

1,425,893,465 = Population of the in 2018.^[23]^[24]

People's Republic of China

1,453,933,568 = 68⁵

1,464,407,113 : number of series-reduced trees with 39 nodes

[25]

1,466,439,680 : number of and vertex covers in the 21-sunlet graph^[26]

independent vertex sets

1,475,789,056 = 38416² = 196⁴ = 14⁸

1,528,823,808 = 1152³

1,533,776,805 : pentagonal triangular number

1,544,804,416 = 39304² = 1156³ = 34⁶

1,564,031,349 = 69⁵

1,606,879,040 : Dowling number

[27]

1,631,432,881 = 40391²,

square triangular number

1,661,392,258 : n such that n divides (3ⁿ + 5)

[28]

1,673,196,525 : Least common multiple of the odd integers from 1 to 25

1,677,922,740 : number of series-reduced planted trees with 36 nodes

[29]

1,680,700,000 = 70⁵

1,755,206,648 : coefficient of a ménage hit polynomial

[30]

1,767,263,190 = $C(19)={\frac {\binom {2\times 19}{19}}{19+1}}={\frac {(2\times 19)!}{19!\times (19+1)!}}$

[31]

1,787,109,376 : 1-^[32]

automorphic number

1,801,088,541 = 21⁷

1,804,229,351 = 71⁵

1,808,141,741 : number of partitions of 280 into divisors of 280

[33]

1,808,676,326 : number of 38-bead necklaces (turning over is allowed) where complements are equivalent

[34]

1,836,311,903 : 46th Fibonacci number.

1,838,265,625 = 42875² = 1225³ = 35⁶

1,848,549,332 : number of partitions of 270 into divisors of 270

[33]

1,857,283,156 : number of 37-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed

[35]

1,882,341,361 : The smallest prime whose reversal is a (triangular of 57121).

square triangular number

1,934,917,632 = 72⁵

1,934,502,740 : number of parallelogram polyominoes with 27 cells.

[36]

1,996,813,914 : Leyland number

1,977,326,743 = 7¹¹

1,921,525,212 : number of partitions of 264 into divisors of 264