13520931 has 8 divisors (see below), whose sum is σ = 18649680. Its totient is φ = 8703072.

The previous prime is 13520921. The next prime is 13520953. The reversal of 13520931 is 13902531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13520931 - 2¹⁰ = 13519907 is a prime.

It is a super-2 number, since 2×13520931² = 365631150213522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13520911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77620 + ... + 77793.

It is an arithmetic number, because the mean of its divisors is an integer number (2331210).

Almost surely, 2^13520931 is an apocalyptic number.

13520931 is a deficient number, since it is larger than the sum of its proper divisors (5128749).

13520931 is a wasteful number, since it uses less digits than its factorization.

13520931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155445.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 13520931 is about 3677.0818593009. The cubic root of 13520931 is about 238.2331531084.

The spelling of 13520931 in words is "thirteen million, five hundred twenty thousand, nine hundred thirty-one".