312946391 has 2 divisors, whose sum is σ = 312946392. Its totient is φ = 312946390.

The previous prime is 312946369. The next prime is 312946423. The reversal of 312946391 is 193649213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312946391 - 2⁶ = 312946327 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312946301) 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, 156473195 + 156473196.

It is an arithmetic number, because the mean of its divisors is an integer number (156473196).

Almost surely, 2^312946391 is an apocalyptic number.

312946391 is a deficient number, since it is larger than the sum of its proper divisors (1).

312946391 is an equidigital number, since it uses as much as digits as its factorization.

312946391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 38.

The square root of 312946391 is about 17690.2908681570. The cubic root of 312946391 is about 678.9273681765.

The spelling of 312946391 in words is "three hundred twelve million, nine hundred forty-six thousand, three hundred ninety-one".