312118813 has 2 divisors, whose sum is σ = 312118814. Its totient is φ = 312118812.

The previous prime is 312118789. The next prime is 312118831. The reversal of 312118813 is 318811213.

Together with next prime (312118831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289442169 + 22676644 = 17013^2 + 4762^2 .

It is a cyclic number.

It is not a de Polignac number, because 312118813 - 2²⁵ = 278564381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312118843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156059406 + 156059407.

It is an arithmetic number, because the mean of its divisors is an integer number (156059407).

Almost surely, 2^312118813 is an apocalyptic number.

It is an amenable number.

312118813 is a deficient number, since it is larger than the sum of its proper divisors (1).

312118813 is an equidigital number, since it uses as much as digits as its factorization.

312118813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 28.

The square root of 312118813 is about 17666.8846433094. The cubic root of 312118813 is about 678.3283716948.

The spelling of 312118813 in words is "three hundred twelve million, one hundred eighteen thousand, eight hundred thirteen".