31217012868 has 24 divisors (see below), whose sum is σ = 73152319968. Its totient is φ = 10361010496.

The previous prime is 31217012857. The next prime is 31217012899. The reversal of 31217012868 is 86821071213.

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, 5579646 + ... + 5585237.

It is an arithmetic number, because the mean of its divisors is an integer number (3048013332).

Almost surely, 2^31217012868 is an apocalyptic number.

It is an amenable number.

31217012868 is an abundant number, since it is smaller than the sum of its proper divisors (41935307100).

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

31217012868 is a wasteful number, since it uses less digits than its factorization.

31217012868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11165123 (or 11165121 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 31217012868 in words is "thirty-one billion, two hundred seventeen million, twelve thousand, eight hundred sixty-eight".