13231231 has 4 divisors (see below), whose sum is σ = 14249032. Its totient is φ = 12213432.

The previous prime is 13231189. The next prime is 13231247. The reversal of 13231231 is 13213231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13231231 - 2⁷ = 13231103 is a prime.

It is a super-2 number, since 2×13231231² = 350130947550722, 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 (13231261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508881 + ... + 508906.

It is an arithmetic number, because the mean of its divisors is an integer number (3562258).

Almost surely, 2^13231231 is an apocalyptic number.

13231231 is a deficient number, since it is larger than the sum of its proper divisors (1017801).

13231231 is a wasteful number, since it uses less digits than its factorization.

13231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017800.

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

The square root of 13231231 is about 3637.4759105732. The cubic root of 13231231 is about 236.5193901743.

Adding to 13231231 its reverse (13213231), we get a palindrome (26444462).

It can be divided in two parts, 13 and 231231, that multiplied together give a palindrome (3006003).

The spelling of 13231231 in words is "thirteen million, two hundred thirty-one thousand, two hundred thirty-one".