231311022331 has 4 divisors (see below), whose sum is σ = 231312050200. Its totient is φ = 231309994464.

The previous prime is 231311022329. The next prime is 231311022337. The reversal of 231311022331 is 133220113132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 231311022331 - 2¹ = 231311022329 is a prime.

It is a super-2 number, since 2×231311022331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231311022337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14766 + ... + 680323.

It is an arithmetic number, because the mean of its divisors is an integer number (57828012550).

Almost surely, 2^231311022331 is an apocalyptic number.

231311022331 is a deficient number, since it is larger than the sum of its proper divisors (1027869).

231311022331 is an equidigital number, since it uses as much as digits as its factorization.

231311022331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027868.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 231311022331 its reverse (133220113132), we get a palindrome (364531135463).

The spelling of 231311022331 in words is "two hundred thirty-one billion, three hundred eleven million, twenty-two thousand, three hundred thirty-one".