31817087812 has 24 divisors (see below), whose sum is σ = 59517868032. Its totient is φ = 14845723200.

The previous prime is 31817087807. The next prime is 31817087831. The reversal of 31817087812 is 21878071813.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4213764 + ... + 4221307.

It is an arithmetic number, because the mean of its divisors is an integer number (2479911168).

Almost surely, 2^31817087812 is an apocalyptic number.

It is an amenable number.

31817087812 is a deficient number, since it is larger than the sum of its proper divisors (27700780220).

31817087812 is a wasteful number, since it uses less digits than its factorization.

31817087812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8435139 (or 8435137 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 46.

The spelling of 31817087812 in words is "thirty-one billion, eight hundred seventeen million, eighty-seven thousand, eight hundred twelve".