64833221 has 2 divisors, whose sum is σ = 64833222. Its totient is φ = 64833220.

The previous prime is 64833203. The next prime is 64833229. The reversal of 64833221 is 12233846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38925121 + 25908100 = 6239^2 + 5090^2 .

It is a cyclic number.

It is not a de Polignac number, because 64833221 - 2¹⁸ = 64571077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64833229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32416610 + 32416611.

It is an arithmetic number, because the mean of its divisors is an integer number (32416611).

Almost surely, 2^64833221 is an apocalyptic number.

It is an amenable number.

64833221 is a deficient number, since it is larger than the sum of its proper divisors (1).

64833221 is an equidigital number, since it uses as much as digits as its factorization.

64833221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

The square root of 64833221 is about 8051.9079105514. The cubic root of 64833221 is about 401.7283979279.

The spelling of 64833221 in words is "sixty-four million, eight hundred thirty-three thousand, two hundred twenty-one".