315660731 has 2 divisors, whose sum is σ = 315660732. Its totient is φ = 315660730.

The previous prime is 315660713. The next prime is 315660733. The reversal of 315660731 is 137066513.

Together with previous prime (315660713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315660731 is a prime.

It is a super-2 number, since 2×315660731² = 199283394190908722, which contains 22 as substring.

Together with 315660733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (315660733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157830365 + 157830366.

It is an arithmetic number, because the mean of its divisors is an integer number (157830366).

Almost surely, 2^315660731 is an apocalyptic number.

315660731 is a deficient number, since it is larger than the sum of its proper divisors (1).

315660731 is an equidigital number, since it uses as much as digits as its factorization.

315660731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 315660731 is about 17766.8435857358. The cubic root of 315660731 is about 680.8846121172.

The spelling of 315660731 in words is "three hundred fifteen million, six hundred sixty thousand, seven hundred thirty-one".