8549221 has 4 divisors (see below), whose sum is σ = 8999200. Its totient is φ = 8099244.

The previous prime is 8549201. The next prime is 8549243. The reversal of 8549221 is 1229458.

8549221 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, and also an emirpimes, since its reverse is a distinct semiprime: 1229458 = 2 ⋅614729.

It is not a de Polignac number, because 8549221 - 2¹¹ = 8547173 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 (8549201) 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, 224961 + ... + 224998.

It is an arithmetic number, because the mean of its divisors is an integer number (2249800).

Almost surely, 2^8549221 is an apocalyptic number.

It is an amenable number.

8549221 is a deficient number, since it is larger than the sum of its proper divisors (449979).

8549221 is a wasteful number, since it uses less digits than its factorization.

8549221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449978.

The product of its digits is 5760, while the sum is 31.

The square root of 8549221 is about 2923.9050942190. The cubic root of 8549221 is about 204.4759248962.

The spelling of 8549221 in words is "eight million, five hundred forty-nine thousand, two hundred twenty-one".