31975421679 has 16 divisors (see below), whose sum is σ = 48264789600. Its totient is φ = 20914740288.

The previous prime is 31975421657. The next prime is 31975421707. The reversal of 31975421679 is 97612457913.

31975421679 is a `hidden beast` number, since 3 + 1 + 97 + 542 + 1 + 6 + 7 + 9 = 666.

It is not a de Polignac number, because 31975421679 - 2⁷ = 31975421551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31975421279) 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, 11170974 + ... + 11173835.

It is an arithmetic number, because the mean of its divisors is an integer number (3016549350).

Almost surely, 2^31975421679 is an apocalyptic number.

31975421679 is a deficient number, since it is larger than the sum of its proper divisors (16289367921).

31975421679 is a wasteful number, since it uses less digits than its factorization.

31975421679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22344871 (or 22344865 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The spelling of 31975421679 in words is "thirty-one billion, nine hundred seventy-five million, four hundred twenty-one thousand, six hundred seventy-nine".