8559221 has 4 divisors (see below), whose sum is σ = 9337344. Its totient is φ = 7781100.

The previous prime is 8559181. The next prime is 8559223. The reversal of 8559221 is 1229558.

8559221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8559221 - 2⁶ = 8559157 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 (8559223) 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, 389045 + ... + 389066.

It is an arithmetic number, because the mean of its divisors is an integer number (2334336).

Almost surely, 2^8559221 is an apocalyptic number.

It is an amenable number.

8559221 is a deficient number, since it is larger than the sum of its proper divisors (778123).

8559221 is a wasteful number, since it uses less digits than its factorization.

8559221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778122.

The product of its digits is 7200, while the sum is 32.

The square root of 8559221 is about 2925.6146362773. The cubic root of 8559221 is about 204.5556188050. Note that the first 3 decimals are identical.

The spelling of 8559221 in words is "eight million, five hundred fifty-nine thousand, two hundred twenty-one".