31991642684 has 12 divisors (see below), whose sum is σ = 55986723408. Its totient is φ = 15995436000.

The previous prime is 31991642623. The next prime is 31991642687. The reversal of 31991642684 is 48624619913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31991642687) 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, 176009 + ... + 308159.

It is an arithmetic number, because the mean of its divisors is an integer number (4665560284).

Almost surely, 2^31991642684 is an apocalyptic number.

It is an amenable number.

31991642684 is a deficient number, since it is larger than the sum of its proper divisors (23995080724).

31991642684 is a wasteful number, since it uses less digits than its factorization.

31991642684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192676 (or 192674 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 53.

The spelling of 31991642684 in words is "thirty-one billion, nine hundred ninety-one million, six hundred forty-two thousand, six hundred eighty-four".