8552221 has 2 divisors, whose sum is σ = 8552222. Its totient is φ = 8552220.

The previous prime is 8552213. The next prime is 8552233. The reversal of 8552221 is 1222558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4995225 + 3556996 = 2235^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 8552221 - 2³ = 8552213 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8552281) 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 as a sum of consecutive naturals, namely, 4276110 + 4276111.

It is an arithmetic number, because the mean of its divisors is an integer number (4276111).

Almost surely, 2^8552221 is an apocalyptic number.

It is an amenable number.

8552221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8552221 is an equidigital number, since it uses as much as digits as its factorization.

8552221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 25.

The square root of 8552221 is about 2924.4180617689. The cubic root of 8552221 is about 204.4998395911.

Adding to 8552221 its reverse (1222558), we get a palindrome (9774779).

The spelling of 8552221 in words is "eight million, five hundred fifty-two thousand, two hundred twenty-one".