13215231 has 10 divisors (see below), whose sum is σ = 19741392. Its totient is φ = 8810100.

The previous prime is 13215229. The next prime is 13215247. The reversal of 13215231 is 13251231.

It is not a de Polignac number, because 13215231 - 2¹ = 13215229 is a prime.

It is a super-2 number, since 2×13215231² = 349284660766722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215221) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 81495 + ... + 81656.

Almost surely, 2^13215231 is an apocalyptic number.

13215231 is a deficient number, since it is larger than the sum of its proper divisors (6526161).

13215231 is an equidigital number, since it uses as much as digits as its factorization.

13215231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163163 (or 163154 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 13215231 is about 3635.2759180013. The cubic root of 13215231 is about 236.4240138970.

Adding to 13215231 its reverse (13251231), we get a palindrome (26466462).

The spelling of 13215231 in words is "thirteen million, two hundred fifteen thousand, two hundred thirty-one".