13231631 has 16 divisors (see below), whose sum is σ = 15575040. Its totient is φ = 11007360.

The previous prime is 13231591. The next prime is 13231633. The reversal of 13231631 is 13613231.

It is a happy number.

It is not a de Polignac number, because 13231631 - 2¹⁴ = 13215247 is a prime.

It is a super-2 number, since 2×13231631² = 350152117840322, 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 (13231633) 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 15 ways as a sum of consecutive naturals, for example, 39095 + ... + 39431.

It is an arithmetic number, because the mean of its divisors is an integer number (973440).

Almost surely, 2^13231631 is an apocalyptic number.

13231631 is a deficient number, since it is larger than the sum of its proper divisors (2343409).

13231631 is an equidigital number, since it uses as much as digits as its factorization.

13231631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494.

The product of its digits is 324, while the sum is 20.

The square root of 13231631 is about 3637.5308933396. The cubic root of 13231631 is about 236.5217735959.

Adding to 13231631 its reverse (13613231), we get a palindrome (26844862).

The spelling of 13231631 in words is "thirteen million, two hundred thirty-one thousand, six hundred thirty-one".