315506561 has 4 divisors (see below), whose sum is σ = 325684224. Its totient is φ = 305328900.

The previous prime is 315506507. The next prime is 315506593. The reversal of 315506561 is 165605513.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165605513 = 43 ⋅3851291.

It is a cyclic number.

It is not a de Polignac number, because 315506561 - 2¹⁴ = 315490177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315506161) 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, 5088785 + ... + 5088846.

It is an arithmetic number, because the mean of its divisors is an integer number (81421056).

Almost surely, 2^315506561 is an apocalyptic number.

315506561 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

315506561 is a deficient number, since it is larger than the sum of its proper divisors (10177663).

315506561 is a wasteful number, since it uses less digits than its factorization.

315506561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10177662.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 315506561 is about 17762.5043560867. The cubic root of 315506561 is about 680.7737451171.

The spelling of 315506561 in words is "three hundred fifteen million, five hundred six thousand, five hundred sixty-one".