640588219 has 2 divisors, whose sum is σ = 640588220. Its totient is φ = 640588218.

The previous prime is 640588187. The next prime is 640588303. The reversal of 640588219 is 912885046.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640588219 - 2⁵ = 640588187 is a prime.

It is a super-2 number, since 2×640588219² = 820706532643183922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (640588919) 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, 320294109 + 320294110.

It is an arithmetic number, because the mean of its divisors is an integer number (320294110).

Almost surely, 2^640588219 is an apocalyptic number.

640588219 is a deficient number, since it is larger than the sum of its proper divisors (1).

640588219 is an equidigital number, since it uses as much as digits as its factorization.

640588219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 640588219 is about 25309.8443100703. The cubic root of 640588219 is about 862.0378117145.

The spelling of 640588219 in words is "six hundred forty million, five hundred eighty-eight thousand, two hundred nineteen".