315861 has 24 divisors (see below), whose sum is σ = 527040. Its totient is φ = 164736.

The previous prime is 315857. The next prime is 315881. The reversal of 315861 is 168513.

315861 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 315861 - 2² = 315857 is a prime.

315861 is strictly pandigital in base 7.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3505 + ... + 3593.

It is an arithmetic number, because the mean of its divisors is an integer number (21960).

2³¹⁵⁸⁶¹ is an apocalyptic number.

It is an amenable number.

315861 is a deficient number, since it is larger than the sum of its proper divisors (211179).

315861 is a wasteful number, since it uses less digits than its factorization.

315861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 112 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 315861 is about 562.0151243516. The cubic root of 315861 is about 68.1028576021.

It can be divided in two parts, 315 and 861, that added together give a triangular number (1176 = T₄₈).

The spelling of 315861 in words is "three hundred fifteen thousand, eight hundred sixty-one".