315686513 has 4 divisors (see below), whose sum is σ = 320398320. Its totient is φ = 310974708.

The previous prime is 315686507. The next prime is 315686531.

315686513 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 315686513 - 2¹² = 315682417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (315686213) 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, 2355803 + ... + 2355936.

It is an arithmetic number, because the mean of its divisors is an integer number (80099580).

Almost surely, 2^315686513 is an apocalyptic number.

It is an amenable number.

315686513 is a deficient number, since it is larger than the sum of its proper divisors (4711807).

315686513 is an equidigital number, since it uses as much as digits as its factorization.

315686513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4711806.

The product of its digits is 64800, while the sum is 38.

The square root of 315686513 is about 17767.5691359285. The cubic root of 315686513 is about 680.9031489908.

The spelling of 315686513 in words is "three hundred fifteen million, six hundred eighty-six thousand, five hundred thirteen".