31991642683 has 24 divisors (see below), whose sum is σ = 43720855920. Its totient is φ = 23010966720.

The previous prime is 31991642623. The next prime is 31991642687. The reversal of 31991642683 is 38624619913.

It is a happy number.

It is not a de Polignac number, because 31991642683 - 2⁹ = 31991642171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31991642683.

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 23 ways as a sum of consecutive naturals, for example, 2275828 + ... + 2289841.

It is an arithmetic number, because the mean of its divisors is an integer number (1821702330).

Almost surely, 2^31991642683 is an apocalyptic number.

31991642683 is a deficient number, since it is larger than the sum of its proper divisors (11729213237).

31991642683 is a wasteful number, since it uses less digits than its factorization.

31991642683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4565707 (or 4565700 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 52.

The spelling of 31991642683 in words is "thirty-one billion, nine hundred ninety-one million, six hundred forty-two thousand, six hundred eighty-three".