13239231 has 4 divisors (see below), whose sum is σ = 17652312. Its totient is φ = 8826152.

The previous prime is 13239223. The next prime is 13239251. The reversal of 13239231 is 13293231.

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 13239231 - 2³ = 13239223 is a prime.

It is a super-2 number, since 2×13239231² = 350554474942722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13239211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2206536 + ... + 2206541.

It is an arithmetic number, because the mean of its divisors is an integer number (4413078).

Almost surely, 2^13239231 is an apocalyptic number.

13239231 is a deficient number, since it is larger than the sum of its proper divisors (4413081).

13239231 is an equidigital number, since it uses as much as digits as its factorization.

13239231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4413080.

The product of its digits is 972, while the sum is 24.

The square root of 13239231 is about 3638.5754080409. The cubic root of 13239231 is about 236.5670494813.

The spelling of 13239231 in words is "thirteen million, two hundred thirty-nine thousand, two hundred thirty-one".