311312231 has 2 divisors, whose sum is σ = 311312232. Its totient is φ = 311312230.

The previous prime is 311312227. The next prime is 311312249. The reversal of 311312231 is 132213113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311312231 - 2² = 311312227 is a prime.

It is a super-2 number, since 2×311312231² = 193830610340394722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311312201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155656115 + 155656116.

It is an arithmetic number, because the mean of its divisors is an integer number (155656116).

Almost surely, 2^311312231 is an apocalyptic number.

311312231 is a deficient number, since it is larger than the sum of its proper divisors (1).

311312231 is an equidigital number, since it uses as much as digits as its factorization.

311312231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 17.

The square root of 311312231 is about 17644.0423656259. The cubic root of 311312231 is about 677.7435522736.

Adding to 311312231 its reverse (132213113), we get a palindrome (443525344).

The spelling of 311312231 in words is "three hundred eleven million, three hundred twelve thousand, two hundred thirty-one".