2312131231 has 2 divisors, whose sum is σ = 2312131232. Its totient is φ = 2312131230.

The previous prime is 2312131193. The next prime is 2312131273. The reversal of 2312131231 is 1321312132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2312131231 - 2⁷ = 2312131103 is a prime.

It is a super-2 number, since 2×2312131231² = 10691901658731150722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2312131199 and 2312131208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2312131531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1156065615 + 1156065616.

It is an arithmetic number, because the mean of its divisors is an integer number (1156065616).

Almost surely, 2^2312131231 is an apocalyptic number.

2312131231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2312131231 is an equidigital number, since it uses as much as digits as its factorization.

2312131231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 19.

The square root of 2312131231 is about 48084.6257238215. The cubic root of 2312131231 is about 1322.3228214511.

Adding to 2312131231 its reverse (1321312132), we get a palindrome (3633443363).

The spelling of 2312131231 in words is "two billion, three hundred twelve million, one hundred thirty-one thousand, two hundred thirty-one".