639304129 has 2 divisors, whose sum is σ = 639304130. Its totient is φ = 639304128.

The previous prime is 639304123. The next prime is 639304147. The reversal of 639304129 is 921403936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 632271025 + 7033104 = 25145^2 + 2652^2 .

It is a cyclic number.

It is not a de Polignac number, because 639304129 - 2⁹ = 639303617 is a prime.

It is not a weakly prime, because it can be changed into another prime (639304123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319652064 + 319652065.

It is an arithmetic number, because the mean of its divisors is an integer number (319652065).

Almost surely, 2^639304129 is an apocalyptic number.

It is an amenable number.

639304129 is a deficient number, since it is larger than the sum of its proper divisors (1).

639304129 is an equidigital number, since it uses as much as digits as its factorization.

639304129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 639304129 is about 25284.4641825766. The cubic root of 639304129 is about 861.4614276142.

The spelling of 639304129 in words is "six hundred thirty-nine million, three hundred four thousand, one hundred twenty-nine".