315817 has 4 divisors (see below), whose sum is σ = 317140. Its totient is φ = 314496.

The previous prime is 315811. The next prime is 315829. The reversal of 315817 is 718513.

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 33856 + 281961 = 184^2 + 531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315791 and 315800.

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 3 ways as a sum of consecutive naturals, for example, 192 + ... + 817.

It is an arithmetic number, because the mean of its divisors is an integer number (79285).

2³¹⁵⁸¹⁷ is an apocalyptic number.

It is an amenable number.

315817 is a deficient number, since it is larger than the sum of its proper divisors (1323).

315817 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 315817 = (531187)₉.

315817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322.

The product of its digits is 840, while the sum is 25.

The square root of 315817 is about 561.9759781343. The cubic root of 315817 is about 68.0996951721.

The spelling of 315817 in words is "three hundred fifteen thousand, eight hundred seventeen".