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    Billion

    Scientific notation

    1 × 10^9

    Number line

    Number line

    Number name

    1 billion

    SI prefix

    giga (G)

    Number length

    10 decimal digits

    Binary form

    111011100110101100101000000000_2

    Prime factorization

    2^9×5^9

    Residues modulo small integers

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

    Properties

    1000000000 is an even number.

    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

    Comparisons

    ≈ 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)

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