64221583 has 2 divisors, whose sum is σ = 64221584. Its totient is φ = 64221582.

The previous prime is 64221541. The next prime is 64221587. The reversal of 64221583 is 38512246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64221583 - 2⁹ = 64221071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64221587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32110791 + 32110792.

It is an arithmetic number, because the mean of its divisors is an integer number (32110792).

Almost surely, 2^64221583 is an apocalyptic number.

64221583 is a deficient number, since it is larger than the sum of its proper divisors (1).

64221583 is an equidigital number, since it uses as much as digits as its factorization.

64221583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 31.

The square root of 64221583 is about 8013.8369711394. The cubic root of 64221583 is about 400.4610995139.

The spelling of 64221583 in words is "sixty-four million, two hundred twenty-one thousand, five hundred eighty-three".