1 × 10^9

1 billion

giga (G)

10 decimal digits

111011100110101100101000000000_2

2^9×5^9

m | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 1000000000 mod m | 0 | 1 | 0 | 0 | 4 | 6 | 0 | 1

1000000000 = 10^9 is a perfect 9th power.

1000000000 has 5 representations as a sum of 2 squares: 1000000000 = 1200^2 + 31600^2 = 7696^2 + 30672^2 = 10000^2 + 30000^2 = 18000^2 + 26000^2 = 19920^2 + 24560^2

1000000000 is an even number.

≈ 0.13 × the number of people alive today (≈ 7.8×10^9)

≈ 10 × the largest number in the Bible, said to be the number of angels ( 1×10^8)