13111213957 has 2 divisors, whose sum is σ = 13111213958. Its totient is φ = 13111213956.

The previous prime is 13111213937. The next prime is 13111214023. The reversal of 13111213957 is 75931211131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6742216321 + 6368997636 = 82111^2 + 79806^2 .

It is a cyclic number.

It is not a de Polignac number, because 13111213957 - 2²³ = 13102825349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13111213937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6555606978 + 6555606979.

It is an arithmetic number, because the mean of its divisors is an integer number (6555606979).

Almost surely, 2^13111213957 is an apocalyptic number.

It is an amenable number.

13111213957 is a deficient number, since it is larger than the sum of its proper divisors (1).

13111213957 is an equidigital number, since it uses as much as digits as its factorization.

13111213957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 34.

The spelling of 13111213957 in words is "thirteen billion, one hundred eleven million, two hundred thirteen thousand, nine hundred fifty-seven".