12815231 has 12 divisors (see below), whose sum is σ = 15171576. Its totient is φ = 10752720.

The previous prime is 12815227. The next prime is 12815237. The reversal of 12815231 is 13251821.

It is a happy number.

It is not a de Polignac number, because 12815231 - 2² = 12815227 is a prime.

It is a super-2 number, since 2×12815231² = 328460291166722, 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 = 12815197 and 12815206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12815237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2501 + ... + 5646.

It is an arithmetic number, because the mean of its divisors is an integer number (1264298).

Almost surely, 2^12815231 is an apocalyptic number.

12815231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12815231 is a deficient number, since it is larger than the sum of its proper divisors (2356345).

12815231 is a wasteful number, since it uses less digits than its factorization.

12815231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8182 (or 8171 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 12815231 is about 3579.8367281204. The cubic root of 12815231 is about 234.0141650178.

The spelling of 12815231 in words is "twelve million, eight hundred fifteen thousand, two hundred thirty-one".