13013123231 has 4 divisors (see below), whose sum is σ = 13258653912. Its totient is φ = 12767592552.

The previous prime is 13013123191. The next prime is 13013123243. The reversal of 13013123231 is 13232131031.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13013123231 is a prime.

It is a super-2 number, since 2×13013123231² (a number of 21 digits) 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 (13013123531) 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, 122765261 + ... + 122765366.

It is an arithmetic number, because the mean of its divisors is an integer number (3314663478).

Almost surely, 2^13013123231 is an apocalyptic number.

13013123231 is a deficient number, since it is larger than the sum of its proper divisors (245530681).

13013123231 is an equidigital number, since it uses as much as digits as its factorization.

13013123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245530680.

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

Adding to 13013123231 its reverse (13232131031), we get a palindrome (26245254262).

The spelling of 13013123231 in words is "thirteen billion, thirteen million, one hundred twenty-three thousand, two hundred thirty-one".