64365221 has 2 divisors, whose sum is σ = 64365222. Its totient is φ = 64365220.

The previous prime is 64365199. The next prime is 64365227. The reversal of 64365221 is 12256346.

64365221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57532225 + 6832996 = 7585^2 + 2614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64365221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64365227) 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, 32182610 + 32182611.

It is an arithmetic number, because the mean of its divisors is an integer number (32182611).

Almost surely, 2^64365221 is an apocalyptic number.

It is an amenable number.

64365221 is a deficient number, since it is larger than the sum of its proper divisors (1).

64365221 is an equidigital number, since it uses as much as digits as its factorization.

64365221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 64365221 is about 8022.7938400535. The cubic root of 64365221 is about 400.7594343196.

The spelling of 64365221 in words is "sixty-four million, three hundred sixty-five thousand, two hundred twenty-one".