315139531 has 12 divisors (see below), whose sum is σ = 367000200. Its totient is φ = 269818080.

The previous prime is 315139519. The next prime is 315139541. The reversal of 315139531 is 135931513.

It is not a de Polignac number, because 315139531 - 2⁵ = 315139499 is a prime.

It is a super-2 number, since 2×315139531² = 198625847997799922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315139493 and 315139502.

It is not an unprimeable number, because it can be changed into a prime (315139511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48336 + ... + 54466.

It is an arithmetic number, because the mean of its divisors is an integer number (30583350).

Almost surely, 2^315139531 is an apocalyptic number.

315139531 is a deficient number, since it is larger than the sum of its proper divisors (51860669).

315139531 is a wasteful number, since it uses less digits than its factorization.

315139531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7194 (or 7187 counting only the distinct ones).

The product of its digits is 6075, while the sum is 31.

The square root of 315139531 is about 17752.1697547089. The cubic root of 315139531 is about 680.5096604454.

The spelling of 315139531 in words is "three hundred fifteen million, one hundred thirty-nine thousand, five hundred thirty-one".