631691992 has 16 divisors (see below), whose sum is σ = 1185494040. Its totient is φ = 315560256.

The previous prime is 631691969. The next prime is 631691999. The reversal of 631691992 is 299196136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631691999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26173 + ... + 44140.

Almost surely, 2^631691992 is an apocalyptic number.

It is an amenable number.

631691992 is a deficient number, since it is larger than the sum of its proper divisors (553802048).

631691992 is a wasteful number, since it uses less digits than its factorization.

631691992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71442 (or 71438 counting only the distinct ones).

The product of its digits is 157464, while the sum is 46.

The square root of 631691992 is about 25133.4834831943. The cubic root of 631691992 is about 858.0286520788.

The spelling of 631691992 in words is "six hundred thirty-one million, six hundred ninety-one thousand, nine hundred ninety-two".