31091972796 has 60 divisors (see below), whose sum is σ = 81354790440. Its totient is φ = 10354525920.

The previous prime is 31091972773. The next prime is 31091972819. The reversal of 31091972796 is 69727919013.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31091972773) and next prime (31091972819).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 316051 + ... + 402581.

It is an arithmetic number, because the mean of its divisors is an integer number (1355913174).

Almost surely, 2^31091972796 is an apocalyptic number.

31091972796 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31091972796 is an abundant number, since it is smaller than the sum of its proper divisors (50262817644).

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

31091972796 is a wasteful number, since it uses less digits than its factorization.

31091972796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87656 (or 87645 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

The spelling of 31091972796 in words is "thirty-one billion, ninety-one million, nine hundred seventy-two thousand, seven hundred ninety-six".