312315391 has 2 divisors, whose sum is σ = 312315392. Its totient is φ = 312315390.

The previous prime is 312315373. The next prime is 312315403. The reversal of 312315391 is 193513213.

It is a strong prime.

It is an emirp because it is prime and its reverse (193513213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312315391 - 2⁹ = 312314879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312315301) 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, 156157695 + 156157696.

It is an arithmetic number, because the mean of its divisors is an integer number (156157696).

Almost surely, 2^312315391 is an apocalyptic number.

312315391 is a deficient number, since it is larger than the sum of its proper divisors (1).

312315391 is an equidigital number, since it uses as much as digits as its factorization.

312315391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 28.

The square root of 312315391 is about 17672.4472272518. The cubic root of 312315391 is about 678.4707495807.

The spelling of 312315391 in words is "three hundred twelve million, three hundred fifteen thousand, three hundred ninety-one".