315985 has 4 divisors (see below), whose sum is σ = 379188. Its totient is φ = 252784.

The previous prime is 315977. The next prime is 316003. The reversal of 315985 is 589513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 238144 + 77841 = 488^2 + 279^2 .

It is a cyclic number.

It is not a de Polignac number, because 315985 - 2³ = 315977 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 315985.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31594 + ... + 31603.

It is an arithmetic number, because the mean of its divisors is an integer number (94797).

2³¹⁵⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

315985 is a deficient number, since it is larger than the sum of its proper divisors (63203).

315985 is an equidigital number, since it uses as much as digits as its factorization.

315985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63202.

The product of its digits is 5400, while the sum is 31.

The square root of 315985 is about 562.1254308426. The cubic root of 315985 is about 68.1117683249. Note that the first 3 decimals are identical.

The spelling of 315985 in words is "three hundred fifteen thousand, nine hundred eighty-five".