231311131213 has 16 divisors (see below), whose sum is σ = 233473084416. Its totient is φ = 229160957760.

The previous prime is 231311131153. The next prime is 231311131223. The reversal of 231311131213 is 312131113132.

It is a cyclic number.

It is not a de Polignac number, because 231311131213 - 2²⁵ = 231277576781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231311131223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62905731 + ... + 62909407.

It is an arithmetic number, because the mean of its divisors is an integer number (14592067776).

Almost surely, 2^231311131213 is an apocalyptic number.

It is an amenable number.

231311131213 is a deficient number, since it is larger than the sum of its proper divisors (2161953203).

231311131213 is a wasteful number, since it uses less digits than its factorization.

231311131213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124.

The product of its digits is 324, while the sum is 22.

Adding to 231311131213 its reverse (312131113132), we get a palindrome (543442244345).

The spelling of 231311131213 in words is "two hundred thirty-one billion, three hundred eleven million, one hundred thirty-one thousand, two hundred thirteen".