13531311631 has 12 divisors (see below), whose sum is σ = 14490236880. Its totient is φ = 12627290720.

The previous prime is 13531311623. The next prime is 13531311649. The reversal of 13531311631 is 13611313531.

It is not a de Polignac number, because 13531311631 - 2³ = 13531311623 is a prime.

It is a super-2 number, since 2×13531311631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13531311631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531311611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 290251 + ... + 333628.

It is an arithmetic number, because the mean of its divisors is an integer number (1207519740).

Almost surely, 2^13531311631 is an apocalyptic number.

13531311631 is a deficient number, since it is larger than the sum of its proper divisors (958925249).

13531311631 is an equidigital number, since it uses as much as digits as its factorization.

13531311631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623966 (or 623943 counting only the distinct ones).

The product of its digits is 2430, while the sum is 28.

The spelling of 13531311631 in words is "thirteen billion, five hundred thirty-one million, three hundred eleven thousand, six hundred thirty-one".