13131231931 has 2 divisors, whose sum is σ = 13131231932. Its totient is φ = 13131231930.

The previous prime is 13131231923. The next prime is 13131232007. The reversal of 13131231931 is 13913213131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13131231931 - 2³ = 13131231923 is a prime.

It is a super-2 number, since 2×13131231931² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13131231931.

It is not a weakly prime, because it can be changed into another prime (13131231031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6565615965 + 6565615966.

It is an arithmetic number, because the mean of its divisors is an integer number (6565615966).

Almost surely, 2^13131231931 is an apocalyptic number.

13131231931 is a deficient number, since it is larger than the sum of its proper divisors (1).

13131231931 is an equidigital number, since it uses as much as digits as its factorization.

13131231931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 28.

The spelling of 13131231931 in words is "thirteen billion, one hundred thirty-one million, two hundred thirty-one thousand, nine hundred thirty-one".