13523231 has 4 divisors (see below), whose sum is σ = 14235000. Its totient is φ = 12811464.

The previous prime is 13523227. The next prime is 13523239. The reversal of 13523231 is 13232531.

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 13523231 - 2² = 13523227 is a prime.

It is a super-2 number, since 2×13523231² = 365755553358722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13523239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355856 + ... + 355893.

It is an arithmetic number, because the mean of its divisors is an integer number (3558750).

Almost surely, 2^13523231 is an apocalyptic number.

13523231 is a deficient number, since it is larger than the sum of its proper divisors (711769).

13523231 is an equidigital number, since it uses as much as digits as its factorization.

13523231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711768.

The product of its digits is 540, while the sum is 20.

The square root of 13523231 is about 3677.3945940027. The cubic root of 13523231 is about 238.2466606888.

Adding to 13523231 its reverse (13232531), we get a palindrome (26755762).

The spelling of 13523231 in words is "thirteen million, five hundred twenty-three thousand, two hundred thirty-one".