131399979913 has 2 divisors, whose sum is σ = 131399979914. Its totient is φ = 131399979912.

The previous prime is 131399979901. The next prime is 131399979943. The reversal of 131399979913 is 319979993131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129533048649 + 1866931264 = 359907^2 + 43208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131399979913 is a prime.

It is a super-2 number, since 2×131399979913² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131399979943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65699989956 + 65699989957.

It is an arithmetic number, because the mean of its divisors is an integer number (65699989957).

Almost surely, 2^131399979913 is an apocalyptic number.

It is an amenable number.

131399979913 is a deficient number, since it is larger than the sum of its proper divisors (1).

131399979913 is an equidigital number, since it uses as much as digits as its factorization.

131399979913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11160261, while the sum is 64.

The spelling of 131399979913 in words is "one hundred thirty-one billion, three hundred ninety-nine million, nine hundred seventy-nine thousand, nine hundred thirteen".