315391243 has 2 divisors, whose sum is σ = 315391244. Its totient is φ = 315391242.

The previous prime is 315391187. The next prime is 315391247. The reversal of 315391243 is 342193513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 315391243 - 2⁹ = 315390731 is a prime.

It is a super-2 number, since 2×315391243² = 198943272322170098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (315391247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157695621 + 157695622.

It is an arithmetic number, because the mean of its divisors is an integer number (157695622).

Almost surely, 2^315391243 is an apocalyptic number.

315391243 is a deficient number, since it is larger than the sum of its proper divisors (1).

315391243 is an equidigital number, since it uses as much as digits as its factorization.

315391243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 315391243 is about 17759.2579518402. The cubic root of 315391243 is about 680.6907938223.

The spelling of 315391243 in words is "three hundred fifteen million, three hundred ninety-one thousand, two hundred forty-three".