31979717793 has 6 divisors (see below), whose sum is σ = 46192925714. Its totient is φ = 21319811856.

The previous prime is 31979717717. The next prime is 31979717837. The reversal of 31979717793 is 39771797913.

It can be written as a sum of positive squares in only one way, i.e., 21344333409 + 10635384384 = 146097^2 + 103128^2 .

It is not a de Polignac number, because 31979717793 - 2²⁶ = 31912608929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31979717793.

It is not an unprimeable number, because it can be changed into a prime (31979717593) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1776650980 + ... + 1776650997.

Almost surely, 2^31979717793 is an apocalyptic number.

It is an amenable number.

31979717793 is a deficient number, since it is larger than the sum of its proper divisors (14213207921).

31979717793 is a wasteful number, since it uses less digits than its factorization.

31979717793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553301983 (or 3553301980 counting only the distinct ones).

The product of its digits is 15752961, while the sum is 63.

The spelling of 31979717793 in words is "thirty-one billion, nine hundred seventy-nine million, seven hundred seventeen thousand, seven hundred ninety-three".