31917317568 has 112 divisors (see below), whose sum is σ = 84983421600. Its totient is φ = 10571894784.

The previous prime is 31917317563. The next prime is 31917317569. The reversal of 31917317568 is 86571371913.

It is a super-2 number, since 2×31917317568² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31917317568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31917317563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24993346 + ... + 24994622.

It is an arithmetic number, because the mean of its divisors is an integer number (758780550).

Almost surely, 2^31917317568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31917317568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42491710800).

31917317568 is an abundant number, since it is smaller than the sum of its proper divisors (53066104032).

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

31917317568 is a wasteful number, since it uses less digits than its factorization.

31917317568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014 (or 2004 counting only the distinct ones).

The product of its digits is 952560, while the sum is 51.

The spelling of 31917317568 in words is "thirty-one billion, nine hundred seventeen million, three hundred seventeen thousand, five hundred sixty-eight".