13231312 has 10 divisors (see below), whose sum is σ = 25635698. Its totient is φ = 6615648.

The previous prime is 13231297. The next prime is 13231313. The reversal of 13231312 is 21313231.

It can be written as a sum of positive squares in only one way, i.e., 13220496 + 10816 = 3636^2 + 104^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 826957 = 13231312 / (1 + 3 + 2 + 3 + 1 + 3 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413463 + ... + 413494.

Almost surely, 2^13231312 is an apocalyptic number.

It is an amenable number.

13231312 is a deficient number, since it is larger than the sum of its proper divisors (12404386).

13231312 is an equidigital number, since it uses as much as digits as its factorization.

13231312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826965 (or 826959 counting only the distinct ones).

The product of its digits is 108, while the sum is 16.

The square root of 13231312 is about 3637.4870446505. The cubic root of 13231312 is about 236.5198728211.

Adding to 13231312 its reverse (21313231), we get a palindrome (34544543).

The spelling of 13231312 in words is "thirteen million, two hundred thirty-one thousand, three hundred twelve".