64221139 has 2 divisors, whose sum is σ = 64221140. Its totient is φ = 64221138.

The previous prime is 64221137. The next prime is 64221163. The reversal of 64221139 is 93112246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64221139 - 2¹ = 64221137 is a prime.

Together with 64221137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64221137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32110569 + 32110570.

It is an arithmetic number, because the mean of its divisors is an integer number (32110570).

Almost surely, 2^64221139 is an apocalyptic number.

64221139 is a deficient number, since it is larger than the sum of its proper divisors (1).

64221139 is an equidigital number, since it uses as much as digits as its factorization.

64221139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 64221139 is about 8013.8092690056. The cubic root of 64221139 is about 400.4601766406.

The spelling of 64221139 in words is "sixty-four million, two hundred twenty-one thousand, one hundred thirty-nine".