556279921 has 4 divisors (see below), whose sum is σ = 568115712. Its totient is φ = 544444132.

The previous prime is 556279901. The next prime is 556279931. The reversal of 556279921 is 129972655.

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 556279921 - 2²³ = 547891313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556279901) 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, 5917825 + ... + 5917918.

It is an arithmetic number, because the mean of its divisors is an integer number (142028928).

Almost surely, 2^556279921 is an apocalyptic number.

It is an amenable number.

556279921 is a deficient number, since it is larger than the sum of its proper divisors (11835791).

556279921 is a wasteful number, since it uses less digits than its factorization.

556279921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11835790.

The product of its digits is 340200, while the sum is 46.

The square root of 556279921 is about 23585.5871455429. The cubic root of 556279921 is about 822.4278240328.

The spelling of 556279921 in words is "five hundred fifty-six million, two hundred seventy-nine thousand, nine hundred twenty-one".