312331081 has 2 divisors, whose sum is σ = 312331082. Its totient is φ = 312331080.

The previous prime is 312331069. The next prime is 312331109. The reversal of 312331081 is 180133213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253287225 + 59043856 = 15915^2 + 7684^2 .

It is a cyclic number.

It is not a de Polignac number, because 312331081 - 2⁵ = 312331049 is a prime.

It is a super-2 number, since 2×312331081² = 195101408317257122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (312331051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156165540 + 156165541.

It is an arithmetic number, because the mean of its divisors is an integer number (156165541).

Almost surely, 2^312331081 is an apocalyptic number.

It is an amenable number.

312331081 is a deficient number, since it is larger than the sum of its proper divisors (1).

312331081 is an equidigital number, since it uses as much as digits as its factorization.

312331081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 312331081 is about 17672.8911330320. The cubic root of 312331081 is about 678.4821109888.

Adding to 312331081 its reverse (180133213), we get a palindrome (492464294).

The spelling of 312331081 in words is "three hundred twelve million, three hundred thirty-one thousand, eighty-one".