13131531857 has 2 divisors, whose sum is σ = 13131531858. Its totient is φ = 13131531856.

The previous prime is 13131531713. The next prime is 13131531869. The reversal of 13131531857 is 75813513131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6737290561 + 6394241296 = 82081^2 + 79964^2 .

It is a cyclic number.

It is not a de Polignac number, because 13131531857 - 2¹⁴ = 13131515473 is a prime.

It is a super-2 number, since 2×13131531857² (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 13131531857.

It is not a weakly prime, because it can be changed into another prime (13131531157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6565765928 + 6565765929.

It is an arithmetic number, because the mean of its divisors is an integer number (6565765929).

Almost surely, 2^13131531857 is an apocalyptic number.

It is an amenable number.

13131531857 is a deficient number, since it is larger than the sum of its proper divisors (1).

13131531857 is an equidigital number, since it uses as much as digits as its factorization.

13131531857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 38.

The spelling of 13131531857 in words is "thirteen billion, one hundred thirty-one million, five hundred thirty-one thousand, eight hundred fifty-seven".