13520402531 has 4 divisors (see below), whose sum is σ = 13521692592. Its totient is φ = 13519112472.

The previous prime is 13520402513. The next prime is 13520402543.

It is a happy number.

13520402531 is nontrivially palindromic in base 10.

13520402531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13520402531 - 2¹⁴ = 13520386147 is a prime.

It is a super-2 number, since 2×13520402531² (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 13520402531.

It is not an unprimeable number, because it can be changed into a prime (13520402561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629180 + ... + 650313.

It is an arithmetic number, because the mean of its divisors is an integer number (3380423148).

Almost surely, 2^13520402531 is an apocalyptic number.

13520402531 is a deficient number, since it is larger than the sum of its proper divisors (1290061).

13520402531 is a wasteful number, since it uses less digits than its factorization.

13520402531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290060.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 13520402531 in words is "thirteen billion, five hundred twenty million, four hundred two thousand, five hundred thirty-one".