231311311311 has 4 divisors (see below), whose sum is σ = 308415081752. Its totient is φ = 154207540872.

The previous prime is 231311311229. The next prime is 231311311333. The reversal of 231311311311 is 113113113132.

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

It is not a de Polignac number, because 231311311311 - 2¹⁵ = 231311278543 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 (231311310311) 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, 38551885216 + ... + 38551885221.

It is an arithmetic number, because the mean of its divisors is an integer number (77103770438).

Almost surely, 2^231311311311 is an apocalyptic number.

231311311311 is a deficient number, since it is larger than the sum of its proper divisors (77103770441).

231311311311 is an equidigital number, since it uses as much as digits as its factorization.

231311311311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77103770440.

The product of its digits is 162, while the sum is 21.

Adding to 231311311311 its reverse (113113113132), we get a palindrome (344424424443).

It can be divided in two parts, 2 and 31311311311, that added together give a palindrome (31311311313).

The spelling of 231311311311 in words is "two hundred thirty-one billion, three hundred eleven million, three hundred eleven thousand, three hundred eleven".