13520523531 has 16 divisors (see below), whose sum is σ = 18205689600. Its totient is φ = 8924611488.

The previous prime is 13520523517. The next prime is 13520523559. The reversal of 13520523531 is 13532502531.

It is not a de Polignac number, because 13520523531 - 2⁷ = 13520523403 is a prime.

It is a super-2 number, since 2×13520523531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13520523431) 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, 640930 + ... + 661688.

It is an arithmetic number, because the mean of its divisors is an integer number (1137855600).

Almost surely, 2^13520523531 is an apocalyptic number.

13520523531 is a deficient number, since it is larger than the sum of its proper divisors (4685166069).

13520523531 is a wasteful number, since it uses less digits than its factorization.

13520523531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22898.

The product of its (nonzero) digits is 13500, while the sum is 30.

The spelling of 13520523531 in words is "thirteen billion, five hundred twenty million, five hundred twenty-three thousand, five hundred thirty-one".