556561423 has 4 divisors (see below), whose sum is σ = 607157928. Its totient is φ = 505964920.

The previous prime is 556561391. The next prime is 556561457. The reversal of 556561423 is 324165655.

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 556561423 - 2⁵ = 556561391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556561483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25298236 + ... + 25298257.

It is an arithmetic number, because the mean of its divisors is an integer number (151789482).

Almost surely, 2^556561423 is an apocalyptic number.

556561423 is a deficient number, since it is larger than the sum of its proper divisors (50596505).

556561423 is a wasteful number, since it uses less digits than its factorization.

556561423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50596504.

The product of its digits is 108000, while the sum is 37.

The square root of 556561423 is about 23591.5540607227. The cubic root of 556561423 is about 822.5665288031.

The spelling of 556561423 in words is "five hundred fifty-six million, five hundred sixty-one thousand, four hundred twenty-three".