31391616844 has 24 divisors (see below), whose sum is σ = 63488668320. Its totient is φ = 13302385536.

The previous prime is 31391616799. The next prime is 31391616887. The reversal of 31391616844 is 44861619313.

It is a junction number, because it is equal to n+sod(n) for n = 31391616794 and 31391616803.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6295987 + ... + 6300970.

It is an arithmetic number, because the mean of its divisors is an integer number (2645361180).

Almost surely, 2^31391616844 is an apocalyptic number.

It is an amenable number.

31391616844 is an abundant number, since it is smaller than the sum of its proper divisors (32097051476).

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

31391616844 is a wasteful number, since it uses less digits than its factorization.

31391616844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12597057 (or 12597055 counting only the distinct ones).

The product of its digits is 373248, while the sum is 46.

The spelling of 31391616844 in words is "thirty-one billion, three hundred ninety-one million, six hundred sixteen thousand, eight hundred forty-four".