31172797992 has 32 divisors (see below), whose sum is σ = 89065137600. Its totient is φ = 8906513664.

The previous prime is 31172797991. The next prime is 31172798011. The reversal of 31172797992 is 29979727113.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31172797991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92776017 + ... + 92776352.

It is an arithmetic number, because the mean of its divisors is an integer number (2783285550).

Almost surely, 2^31172797992 is an apocalyptic number.

It is an amenable number.

31172797992 is an abundant number, since it is smaller than the sum of its proper divisors (57892339608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31172797992 is a wasteful number, since it uses less digits than its factorization.

31172797992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185552385 (or 185552381 counting only the distinct ones).

The product of its digits is 3000564, while the sum is 57.

The spelling of 31172797992 in words is "thirty-one billion, one hundred seventy-two million, seven hundred ninety-seven thousand, nine hundred ninety-two".