999907631 has 4 divisors (see below), whose sum is σ = 1024295664. Its totient is φ = 975519600.

The previous prime is 999907627. The next prime is 999907651. The reversal of 999907631 is 136709999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 999907631 - 2² = 999907627 is a prime.

It is a super-2 number, since 2×999907631² = 1999630541064064322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999907651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12193955 + ... + 12194036.

It is an arithmetic number, because the mean of its divisors is an integer number (256073916).

Almost surely, 2^999907631 is an apocalyptic number.

999907631 is a deficient number, since it is larger than the sum of its proper divisors (24388033).

999907631 is a wasteful number, since it uses less digits than its factorization.

999907631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24388032.

The product of its (nonzero) digits is 826686, while the sum is 53.

The square root of 999907631 is about 31621.3160858305. The cubic root of 999907631 is about 999.9692093853.

The spelling of 999907631 in words is "nine hundred ninety-nine million, nine hundred seven thousand, six hundred thirty-one".