639311339 has 2 divisors, whose sum is σ = 639311340. Its totient is φ = 639311338.

The previous prime is 639311329. The next prime is 639311353. The reversal of 639311339 is 933113936.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639311339 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (639311329) 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, 319655669 + 319655670.

It is an arithmetic number, because the mean of its divisors is an integer number (319655670).

Almost surely, 2^639311339 is an apocalyptic number.

639311339 is a deficient number, since it is larger than the sum of its proper divisors (1).

639311339 is an equidigital number, since it uses as much as digits as its factorization.

639311339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 38.

The square root of 639311339 is about 25284.6067598450. The cubic root of 639311339 is about 861.4646660904.

The spelling of 639311339 in words is "six hundred thirty-nine million, three hundred eleven thousand, three hundred thirty-nine".