12513231 has 8 divisors (see below), whose sum is σ = 18538160. Its totient is φ = 8342136.

The previous prime is 12513227. The next prime is 12513269. The reversal of 12513231 is 13231521.

It is not a de Polignac number, because 12513231 - 2² = 12513227 is a prime.

It is a super-2 number, since 2×12513231² = 313161900118722, 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 (12513271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231700 + ... + 231753.

It is an arithmetic number, because the mean of its divisors is an integer number (2317270).

Almost surely, 2^12513231 is an apocalyptic number.

12513231 is a deficient number, since it is larger than the sum of its proper divisors (6024929).

12513231 is an equidigital number, since it uses as much as digits as its factorization.

12513231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463462 (or 463456 counting only the distinct ones).

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

The square root of 12513231 is about 3537.4045570163. The cubic root of 12513231 is about 232.1612966226.

Adding to 12513231 its reverse (13231521), we get a palindrome (25744752).

The spelling of 12513231 in words is "twelve million, five hundred thirteen thousand, two hundred thirty-one".