13520831 has 4 divisors (see below), whose sum is σ = 14316192. Its totient is φ = 12725472.

The previous prime is 13520827. The next prime is 13520839. The reversal of 13520831 is 13802531.

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 13520831 - 2² = 13520827 is a prime.

It is a super-2 number, since 2×13520831² = 365625741861122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13520797 and 13520806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13520839) 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, 397655 + ... + 397688.

It is an arithmetic number, because the mean of its divisors is an integer number (3579048).

Almost surely, 2^13520831 is an apocalyptic number.

13520831 is a deficient number, since it is larger than the sum of its proper divisors (795361).

13520831 is an equidigital number, since it uses as much as digits as its factorization.

13520831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795360.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 13520831 is about 3677.0682615366. The cubic root of 13520831 is about 238.2325657876.

The spelling of 13520831 in words is "thirteen million, five hundred twenty thousand, eight hundred thirty-one".