639344711 has 2 divisors, whose sum is σ = 639344712. Its totient is φ = 639344710.

The previous prime is 639344677. The next prime is 639344723. The reversal of 639344711 is 117443936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639344711 - 2¹⁰ = 639343687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639344011) 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, 319672355 + 319672356.

It is an arithmetic number, because the mean of its divisors is an integer number (319672356).

Almost surely, 2^639344711 is an apocalyptic number.

639344711 is a deficient number, since it is larger than the sum of its proper divisors (1).

639344711 is an equidigital number, since it uses as much as digits as its factorization.

639344711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 38.

The square root of 639344711 is about 25285.2666784434. The cubic root of 639344711 is about 861.4796552914.

The spelling of 639344711 in words is "six hundred thirty-nine million, three hundred forty-four thousand, seven hundred eleven".