315997523 has 4 divisors (see below), whose sum is σ = 316518720. Its totient is φ = 315476328.

The previous prime is 315997489. The next prime is 315997553. The reversal of 315997523 is 325799513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325799513 = 13 ⋅25061501.

It is a cyclic number.

It is not a de Polignac number, because 315997523 - 2⁸ = 315997267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315997553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259688 + ... + 260901.

It is an arithmetic number, because the mean of its divisors is an integer number (79129680).

Almost surely, 2^315997523 is an apocalyptic number.

315997523 is a deficient number, since it is larger than the sum of its proper divisors (521197).

315997523 is an equidigital number, since it uses as much as digits as its factorization.

315997523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521196.

The product of its digits is 255150, while the sum is 44.

The square root of 315997523 is about 17776.3191634264. The cubic root of 315997523 is about 681.1266810647.

The spelling of 315997523 in words is "three hundred fifteen million, nine hundred ninety-seven thousand, five hundred twenty-three".