556502221 has 4 divisors (see below), whose sum is σ = 607093344. Its totient is φ = 505911100.

The previous prime is 556502213. The next prime is 556502239. The reversal of 556502221 is 122205655.

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 556502221 - 2³ = 556502213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 556502221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556502281) 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, 25295545 + ... + 25295566.

It is an arithmetic number, because the mean of its divisors is an integer number (151773336).

Almost surely, 2^556502221 is an apocalyptic number.

It is an amenable number.

556502221 is a deficient number, since it is larger than the sum of its proper divisors (50591123).

556502221 is a wasteful number, since it uses less digits than its factorization.

556502221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50591122.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 556502221 is about 23590.2992986524. The cubic root of 556502221 is about 822.5373620251.

Adding to 556502221 its reverse (122205655), we get a palindrome (678707876).

The spelling of 556502221 in words is "five hundred fifty-six million, five hundred two thousand, two hundred twenty-one".