31518655972 has 24 divisors (see below), whose sum is σ = 56882589120. Its totient is φ = 15274012320.

The previous prime is 31518655933. The next prime is 31518655997. The reversal of 31518655972 is 27955681513.

It is a happy number.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 923763 + ... + 957274.

It is an arithmetic number, because the mean of its divisors is an integer number (2370107880).

Almost surely, 2^31518655972 is an apocalyptic number.

It is an amenable number.

31518655972 is a deficient number, since it is larger than the sum of its proper divisors (25363933148).

31518655972 is a wasteful number, since it uses less digits than its factorization.

31518655972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881171 (or 1881169 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 52.

The spelling of 31518655972 in words is "thirty-one billion, five hundred eighteen million, six hundred fifty-five thousand, nine hundred seventy-two".