12311323231 has 16 divisors (see below), whose sum is σ = 12800450560. Its totient is φ = 11834333280.

The previous prime is 12311323217. The next prime is 12311323237. The reversal of 12311323231 is 13232311321.

It is not a de Polignac number, because 12311323231 - 2²⁷ = 12177105503 is a prime.

It is a super-2 number, since 2×12311323231² (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 (12311323237) 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 15 ways as a sum of consecutive naturals, for example, 507190 + ... + 530908.

It is an arithmetic number, because the mean of its divisors is an integer number (800028160).

Almost surely, 2^12311323231 is an apocalyptic number.

12311323231 is a deficient number, since it is larger than the sum of its proper divisors (489127329).

12311323231 is a wasteful number, since it uses less digits than its factorization.

12311323231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23974.

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

Adding to 12311323231 its reverse (13232311321), we get a palindrome (25543634552).

The spelling of 12311323231 in words is "twelve billion, three hundred eleven million, three hundred twenty-three thousand, two hundred thirty-one".