315031531 has 2 divisors, whose sum is σ = 315031532. Its totient is φ = 315031530.

The previous prime is 315031499. The next prime is 315031543. The reversal of 315031531 is 135130513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 315031531 - 2⁵ = 315031499 is a prime.

It is a super-2 number, since 2×315031531² = 198489731048407922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (315031831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157515765 + 157515766.

It is an arithmetic number, because the mean of its divisors is an integer number (157515766).

Almost surely, 2^315031531 is an apocalyptic number.

315031531 is a deficient number, since it is larger than the sum of its proper divisors (1).

315031531 is an equidigital number, since it uses as much as digits as its factorization.

315031531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 675, while the sum is 22.

The square root of 315031531 is about 17749.1276123645. The cubic root of 315031531 is about 680.4319134652.

The spelling of 315031531 in words is "three hundred fifteen million, thirty-one thousand, five hundred thirty-one".