31979697913 has 2 divisors, whose sum is σ = 31979697914. Its totient is φ = 31979697912.

The previous prime is 31979697907. The next prime is 31979697947.

It is a happy number.

31979697913 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19722550969 + 12257146944 = 140437^2 + 110712^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 31979697913 - 2²⁹ = 31442827001 is a prime.

It is not a weakly prime, because it can be changed into another prime (31979697413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15989848956 + 15989848957.

It is an arithmetic number, because the mean of its divisors is an integer number (15989848957).

Almost surely, 2^31979697913 is an apocalyptic number.

It is an amenable number.

31979697913 is a deficient number, since it is larger than the sum of its proper divisors (1).

31979697913 is an equidigital number, since it uses as much as digits as its factorization.

31979697913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17360406, while the sum is 64.

The spelling of 31979697913 in words is "thirty-one billion, nine hundred seventy-nine million, six hundred ninety-seven thousand, nine hundred thirteen".