556305691 has 4 divisors (see below), whose sum is σ = 556670584. Its totient is φ = 555940800.

The previous prime is 556305689. The next prime is 556305697. The reversal of 556305691 is 196503655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 556305691 - 2¹ = 556305689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556305697) 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, 180150 + ... + 183211.

It is an arithmetic number, because the mean of its divisors is an integer number (139167646).

Almost surely, 2^556305691 is an apocalyptic number.

556305691 is a deficient number, since it is larger than the sum of its proper divisors (364893).

556305691 is a wasteful number, since it uses less digits than its factorization.

556305691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364892.

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 556305691 is about 23586.1334474305. The cubic root of 556305691 is about 822.4405236569.

The spelling of 556305691 in words is "five hundred fifty-six million, three hundred five thousand, six hundred ninety-one".