1000000005

1000000005 is a natural number in the sequence of integers. It follows 1000000004 and precedes 1000000006. In standard decimal notation it is written as 1,000,000,005. The number is odd and lies near the one-billion range.

Mathematically, 1000000005 is composite. It ends with a 5, so it is divisible by 5. The sum of its digits is 6, so it is divisible by 3 as well. Consequently, 1000000005 = 15 × 66,666,667. The cofactor 66,666,667 is not divisible by 2, 3, or 5, and while its full primality is not essential for many discussions, the factorization 3 × 5 × 66,666,667 indicates its composite nature.

In modular arithmetic, 1000000005 has a notable relation to a common modulus. With a modulus of 1,000,000,007 (a widely used prime), 1000000005 ≡ −2 mod 1,000,000,007. This makes it useful as a representative of a near-boundary, non-prime value in calculations. However, because 1000000005 is not prime, it is generally not used as a modulus in number-theoretic or cryptographic contexts.

Contextually, 1,000,000,007 is preferred in many programming tasks as a prime modulus, while 1,000,000,005 is encountered less often and does not have a standard, widely recognized role beyond its arithmetic properties and its relation to nearby moduli. See also 1000000007 and 1000000009 for related primes commonly used in computation.