564221 has 4 divisors (see below), whose sum is σ = 644832. Its totient is φ = 483612.

The previous prime is 564197. The next prime is 564227. The reversal of 564221 is 122465.

564221 = T₃₉₈ + T₃₉₉ + ... + T₄₀₄.

It is a happy number.

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 564221 - 2¹⁰ = 563197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 564193 and 564202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40295 + ... + 40308.

It is an arithmetic number, because the mean of its divisors is an integer number (161208).

2⁵⁶⁴²²¹ is an apocalyptic number.

It is an amenable number.

564221 is a deficient number, since it is larger than the sum of its proper divisors (80611).

564221 is an equidigital number, since it uses as much as digits as its factorization.

564221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80610.

The product of its digits is 480, while the sum is 20.

The square root of 564221 is about 751.1464570908. The cubic root of 564221 is about 82.6322824253.

Adding to 564221 its reverse (122465), we get a palindrome (686686).

The spelling of 564221 in words is "five hundred sixty-four thousand, two hundred twenty-one".