13513231531 has 2 divisors, whose sum is σ = 13513231532. Its totient is φ = 13513231530.

The previous prime is 13513231519. The next prime is 13513231583.

It is a happy number.

13513231531 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 13513231531 - 2⁵ = 13513231499 is a prime.

It is a super-2 number, since 2×13513231531² (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 13513231531.

It is not a weakly prime, because it can be changed into another prime (13513232531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6756615765 + 6756615766.

It is an arithmetic number, because the mean of its divisors is an integer number (6756615766).

Almost surely, 2^13513231531 is an apocalyptic number.

13513231531 is a deficient number, since it is larger than the sum of its proper divisors (1).

13513231531 is an equidigital number, since it uses as much as digits as its factorization.

13513231531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4050, while the sum is 28.

The spelling of 13513231531 in words is "thirteen billion, five hundred thirteen million, two hundred thirty-one thousand, five hundred thirty-one".