312368561 has 2 divisors, whose sum is σ = 312368562. Its totient is φ = 312368560.

The previous prime is 312368521. The next prime is 312368579. The reversal of 312368561 is 165863213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 303630625 + 8737936 = 17425^2 + 2956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312368561 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (312368521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156184280 + 156184281.

It is an arithmetic number, because the mean of its divisors is an integer number (156184281).

Almost surely, 2^312368561 is an apocalyptic number.

It is an amenable number.

312368561 is a deficient number, since it is larger than the sum of its proper divisors (1).

312368561 is an equidigital number, since it uses as much as digits as its factorization.

312368561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 312368561 is about 17673.9514823369. The cubic root of 312368561 is about 678.5092493834.

The spelling of 312368561 in words is "three hundred twelve million, three hundred sixty-eight thousand, five hundred sixty-one".