31216972 has 6 divisors (see below), whose sum is σ = 54629708. Its totient is φ = 15608484.

The previous prime is 31216967. The next prime is 31216993. The reversal of 31216972 is 27961213.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3902118 + ... + 3902125.

Almost surely, 2^31216972 is an apocalyptic number.

It is an amenable number.

31216972 is a deficient number, since it is larger than the sum of its proper divisors (23412736).

31216972 is a wasteful number, since it uses less digits than its factorization.

31216972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7804247 (or 7804245 counting only the distinct ones).

The product of its digits is 4536, while the sum is 31.

The square root of 31216972 is about 5587.2150486624. The cubic root of 31216972 is about 314.8692562307.

The spelling of 31216972 in words is "thirty-one million, two hundred sixteen thousand, nine hundred seventy-two".