64055221 has 2 divisors, whose sum is σ = 64055222. Its totient is φ = 64055220.

The previous prime is 64055209. The next prime is 64055281. The reversal of 64055221 is 12255046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55726225 + 8328996 = 7465^2 + 2886^2 .

It is a cyclic number.

It is not a de Polignac number, because 64055221 - 2⁷ = 64055093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64055281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32027610 + 32027611.

It is an arithmetic number, because the mean of its divisors is an integer number (32027611).

Almost surely, 2^64055221 is an apocalyptic number.

It is an amenable number.

64055221 is a deficient number, since it is larger than the sum of its proper divisors (1).

64055221 is an equidigital number, since it uses as much as digits as its factorization.

64055221 is an evil number, because the sum of its binary digits is even.

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

The square root of 64055221 is about 8003.4505683486. The cubic root of 64055221 is about 400.1150106782.

The spelling of 64055221 in words is "sixty-four million, fifty-five thousand, two hundred twenty-one".