13556865131 has 2 divisors, whose sum is σ = 13556865132. Its totient is φ = 13556865130.

The previous prime is 13556865121. The next prime is 13556865143. The reversal of 13556865131 is 13156865531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13556865131 - 2¹⁸ = 13556602987 is a prime.

It is a super-2 number, since 2×13556865131² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (13556865121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6778432565 + 6778432566.

It is an arithmetic number, because the mean of its divisors is an integer number (6778432566).

Almost surely, 2^13556865131 is an apocalyptic number.

13556865131 is a deficient number, since it is larger than the sum of its proper divisors (1).

13556865131 is an equidigital number, since it uses as much as digits as its factorization.

13556865131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 44.

The spelling of 13556865131 in words is "thirteen billion, five hundred fifty-six million, eight hundred sixty-five thousand, one hundred thirty-one".