4565221 has 4 divisors (see below), whose sum is σ = 4574700. Its totient is φ = 4555744.

The previous prime is 4565203. The next prime is 4565257. The reversal of 4565221 is 1225654.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3101121 + 1464100 = 1761^2 + 1210^2 .

It is a cyclic number.

It is not a de Polignac number, because 4565221 - 2⁵ = 4565189 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 (4565291) 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, 3976 + ... + 4993.

It is an arithmetic number, because the mean of its divisors is an integer number (1143675).

Almost surely, 2^4565221 is an apocalyptic number.

It is an amenable number.

4565221 is a deficient number, since it is larger than the sum of its proper divisors (9479).

4565221 is an equidigital number, since it uses as much as digits as its factorization.

4565221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9478.

The product of its digits is 2400, while the sum is 25.

The square root of 4565221 is about 2136.6377793159. The cubic root of 4565221 is about 165.8901508691.

The spelling of 4565221 in words is "four million, five hundred sixty-five thousand, two hundred twenty-one".