315700031 has 2 divisors, whose sum is σ = 315700032. Its totient is φ = 315700030.

The previous prime is 315699929. The next prime is 315700039. The reversal of 315700031 is 130007513.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315700031 is a prime.

It is a super-2 number, since 2×315700031² = 199333019146801922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315699976 and 315700012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315700039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157850015 + 157850016.

It is an arithmetic number, because the mean of its divisors is an integer number (157850016).

Almost surely, 2^315700031 is an apocalyptic number.

315700031 is a deficient number, since it is larger than the sum of its proper divisors (1).

315700031 is an equidigital number, since it uses as much as digits as its factorization.

315700031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 315, while the sum is 20.

The square root of 315700031 is about 17767.9495440526. The cubic root of 315700031 is about 680.9128678279.

Adding to 315700031 its reverse (130007513), we get a palindrome (445707544).

The spelling of 315700031 in words is "three hundred fifteen million, seven hundred thousand, thirty-one".