315809 has 8 divisors (see below), whose sum is σ = 360360. Its totient is φ = 274176.

The previous prime is 315803. The next prime is 315811. The reversal of 315809 is 908513.

It can be written as a sum of positive squares in 4 ways, for example, as 2209 + 313600 = 47^2 + 560^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 315809 - 2¹² = 311713 is a prime.

It is a Curzon 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 315809.

It is not an unprimeable number, because it can be changed into a prime (315803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494 + ... + 935.

It is an arithmetic number, because the mean of its divisors is an integer number (45045).

2³¹⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

315809 is a deficient number, since it is larger than the sum of its proper divisors (44551).

315809 is a wasteful number, since it uses less digits than its factorization.

315809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 315809 is about 561.9688603473. The cubic root of 315809 is about 68.0991201533.

Subtracting 315809 from its reverse (908513), we obtain a cube (592704 = 84³).

The spelling of 315809 in words is "three hundred fifteen thousand, eight hundred nine".