13521612531 has 16 divisors (see below), whose sum is σ = 21500204544. Its totient is φ = 7390694784.

The previous prime is 13521612521. The next prime is 13521612551.

13521612531 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 13521612531 - 2²³ = 13513223923 is a prime.

It is a super-2 number, since 2×13521612531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13521612521) 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, 13997046 + ... + 13998011.

It is an arithmetic number, because the mean of its divisors is an integer number (1343762784).

Almost surely, 2^13521612531 is an apocalyptic number.

13521612531 is a deficient number, since it is larger than the sum of its proper divisors (7978592013).

13521612531 is a wasteful number, since it uses less digits than its factorization.

13521612531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27995090.

The product of its digits is 5400, while the sum is 30.

The spelling of 13521612531 in words is "thirteen billion, five hundred twenty-one million, six hundred twelve thousand, five hundred thirty-one".