556425921 has 4 divisors (see below), whose sum is σ = 741901232. Its totient is φ = 370950612.

The previous prime is 556425917. The next prime is 556425931. The reversal of 556425921 is 129524655.

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 not a de Polignac number, because 556425921 - 2² = 556425917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 556425921.

It is not an unprimeable number, because it can be changed into a prime (556425901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92737651 + ... + 92737656.

It is an arithmetic number, because the mean of its divisors is an integer number (185475308).

Almost surely, 2^556425921 is an apocalyptic number.

It is an amenable number.

556425921 is a deficient number, since it is larger than the sum of its proper divisors (185475311).

556425921 is a wasteful number, since it uses less digits than its factorization.

556425921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185475310.

The product of its digits is 108000, while the sum is 39.

The square root of 556425921 is about 23588.6820530525. The cubic root of 556425921 is about 822.4997686027.

The spelling of 556425921 in words is "five hundred fifty-six million, four hundred twenty-five thousand, nine hundred twenty-one".