13112312231 has 4 divisors (see below), whose sum is σ = 13215558912. Its totient is φ = 13009065552.

The previous prime is 13112312221. The next prime is 13112312393. The reversal of 13112312231 is 13221321131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13221321131 = 28109 ⋅470359.

It is a cyclic number.

It is not a de Polignac number, because 13112312231 - 2¹⁰ = 13112311207 is a prime.

It is a super-2 number, since 2×13112312231² (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 (13112312221) 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, 51623150 + ... + 51623403.

It is an arithmetic number, because the mean of its divisors is an integer number (3303889728).

Almost surely, 2^13112312231 is an apocalyptic number.

13112312231 is a deficient number, since it is larger than the sum of its proper divisors (103246681).

13112312231 is a wasteful number, since it uses less digits than its factorization.

13112312231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103246680.

The product of its digits is 216, while the sum is 20.

Adding to 13112312231 its reverse (13221321131), we get a palindrome (26333633362).

The spelling of 13112312231 in words is "thirteen billion, one hundred twelve million, three hundred twelve thousand, two hundred thirty-one".