31968869989531 has 4 divisors (see below), whose sum is σ = 31968898363864. Its totient is φ = 31968841615200.

The previous prime is 31968869989493. The next prime is 31968869989541. The reversal of 31968869989531 is 13598996886913.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31968869989531 - 2²⁷ = 31968735771803 is a prime.

It is a super-2 number, since 2×31968869989531² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31968869989541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12424110 + ... + 14774851.

It is an arithmetic number, because the mean of its divisors is an integer number (7992224590966).

Almost surely, 2^{31968869989531} is an apocalyptic number.

31968869989531 is a deficient number, since it is larger than the sum of its proper divisors (28374333).

31968869989531 is a wasteful number, since it uses less digits than its factorization.

31968869989531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28374332.

The product of its digits is 5441955840, while the sum is 85.

The spelling of 31968869989531 in words is "thirty-one trillion, nine hundred sixty-eight billion, eight hundred sixty-nine million, nine hundred eighty-nine thousand, five hundred thirty-one".