13231331231 has 4 divisors (see below), whose sum is σ = 13289110200. Its totient is φ = 13173552264.

The previous prime is 13231331221. The next prime is 13231331261. The reversal of 13231331231 is 13213313231.

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 13231331231 - 2¹⁸ = 13231069087 is a prime.

It is a super-2 number, since 2×13231331231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13231331197 and 13231331206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231331221) 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, 28889141 + ... + 28889598.

It is an arithmetic number, because the mean of its divisors is an integer number (3322277550).

Almost surely, 2^13231331231 is an apocalyptic number.

13231331231 is a deficient number, since it is larger than the sum of its proper divisors (57778969).

13231331231 is an equidigital number, since it uses as much as digits as its factorization.

13231331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57778968.

The product of its digits is 972, while the sum is 23.

Adding to 13231331231 its reverse (13213313231), we get a palindrome (26444644462).

The spelling of 13231331231 in words is "thirteen billion, two hundred thirty-one million, three hundred thirty-one thousand, two hundred thirty-one".