312513391 has 2 divisors, whose sum is σ = 312513392. Its totient is φ = 312513390.

The previous prime is 312513361. The next prime is 312513451. The reversal of 312513391 is 193315213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312513391 - 2¹¹ = 312511343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312513301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156256695 + 156256696.

It is an arithmetic number, because the mean of its divisors is an integer number (156256696).

Almost surely, 2^312513391 is an apocalyptic number.

312513391 is a deficient number, since it is larger than the sum of its proper divisors (1).

312513391 is an equidigital number, since it uses as much as digits as its factorization.

312513391 is an evil number, because the sum of its binary digits is even.

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

The square root of 312513391 is about 17678.0482802825. The cubic root of 312513391 is about 678.6140970146.

The spelling of 312513391 in words is "three hundred twelve million, five hundred thirteen thousand, three hundred ninety-one".