315323131 has 2 divisors, whose sum is σ = 315323132. Its totient is φ = 315323130.

The previous prime is 315323117. The next prime is 315323137. The reversal of 315323131 is 131323513.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 315323131 - 2⁹ = 315322619 is a prime.

It is a super-2 number, since 2×315323131² = 198857353887286322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (315323137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157661565 + 157661566.

It is an arithmetic number, because the mean of its divisors is an integer number (157661566).

Almost surely, 2^315323131 is an apocalyptic number.

315323131 is a deficient number, since it is larger than the sum of its proper divisors (1).

315323131 is an equidigital number, since it uses as much as digits as its factorization.

315323131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 22.

The square root of 315323131 is about 17757.3402006044. The cubic root of 315323131 is about 680.6417895561.

Adding to 315323131 its reverse (131323513), we get a palindrome (446646644).

The spelling of 315323131 in words is "three hundred fifteen million, three hundred twenty-three thousand, one hundred thirty-one".