13531111531 has 16 divisors (see below), whose sum is σ = 16203483648. Its totient is φ = 11047766400.

The previous prime is 13531111513. The next prime is 13531111543. The reversal of 13531111531 is 13511113531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13531111531 is a prime.

It is a super-2 number, since 2×13531111531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13531111496 and 13531111505.

It is not an unprimeable number, because it can be changed into a prime (13531111511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135565 + ... + 213166.

It is an arithmetic number, because the mean of its divisors is an integer number (1012717728).

Almost surely, 2^13531111531 is an apocalyptic number.

13531111531 is a deficient number, since it is larger than the sum of its proper divisors (2672372117).

13531111531 is a wasteful number, since it uses less digits than its factorization.

13531111531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349002.

The product of its digits is 675, while the sum is 25.

The spelling of 13531111531 in words is "thirteen billion, five hundred thirty-one million, one hundred eleven thousand, five hundred thirty-one".