312403391 has 2 divisors, whose sum is σ = 312403392. Its totient is φ = 312403390.

The previous prime is 312403361. The next prime is 312403423. The reversal of 312403391 is 193304213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312403391 - 2⁶ = 312403327 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312403391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312403361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156201695 + 156201696.

It is an arithmetic number, because the mean of its divisors is an integer number (156201696).

Almost surely, 2^312403391 is an apocalyptic number.

312403391 is a deficient number, since it is larger than the sum of its proper divisors (1).

312403391 is an equidigital number, since it uses as much as digits as its factorization.

312403391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 312403391 is about 17674.9368032816. The cubic root of 312403391 is about 678.5344670288.

The spelling of 312403391 in words is "three hundred twelve million, four hundred three thousand, three hundred ninety-one".