315509 has 4 divisors (see below), whose sum is σ = 321516. Its totient is φ = 309504.

The previous prime is 315493. The next prime is 315517. The reversal of 315509 is 905513.

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 87025 + 228484 = 295^2 + 478^2 .

It is a cyclic number.

It is not a de Polignac number, because 315509 - 2⁴ = 315493 is a prime.

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 315509.

It is not an unprimeable number, because it can be changed into a prime (315529) 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, 2924 + ... + 3029.

It is an arithmetic number, because the mean of its divisors is an integer number (80379).

2³¹⁵⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

315509 is a deficient number, since it is larger than the sum of its proper divisors (6007).

315509 is an equidigital number, since it uses as much as digits as its factorization.

315509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6006.

The product of its (nonzero) digits is 675, while the sum is 23.

The square root of 315509 is about 561.7018782237. The cubic root of 315509 is about 68.0775499336.

The spelling of 315509 in words is "three hundred fifteen thousand, five hundred nine".