312243977 has 2 divisors, whose sum is σ = 312243978. Its totient is φ = 312243976.

The previous prime is 312243917. The next prime is 312243979. The reversal of 312243977 is 779342213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167547136 + 144696841 = 12944^2 + 12029^2 .

It is a cyclic number.

It is not a de Polignac number, because 312243977 - 2²⁶ = 245135113 is a prime.

Together with 312243979, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312243977.

It is not a weakly prime, because it can be changed into another prime (312243979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156121988 + 156121989.

It is an arithmetic number, because the mean of its divisors is an integer number (156121989).

Almost surely, 2^312243977 is an apocalyptic number.

It is an amenable number.

312243977 is a deficient number, since it is larger than the sum of its proper divisors (1).

312243977 is an equidigital number, since it uses as much as digits as its factorization.

312243977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 312243977 is about 17670.4266219014. The cubic root of 312243977 is about 678.4190326251.

The spelling of 312243977 in words is "three hundred twelve million, two hundred forty-three thousand, nine hundred seventy-seven".