639137299 has 2 divisors, whose sum is σ = 639137300. Its totient is φ = 639137298.

The previous prime is 639137269. The next prime is 639137309. The reversal of 639137299 is 992731936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639137299 - 2¹¹ = 639135251 is a prime.

It is not a weakly prime, because it can be changed into another prime (639137209) 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, 319568649 + 319568650.

It is an arithmetic number, because the mean of its divisors is an integer number (319568650).

Almost surely, 2^639137299 is an apocalyptic number.

639137299 is a deficient number, since it is larger than the sum of its proper divisors (1).

639137299 is an equidigital number, since it uses as much as digits as its factorization.

639137299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 49.

The square root of 639137299 is about 25281.1649059137. The cubic root of 639137299 is about 861.3864866972.

The spelling of 639137299 in words is "six hundred thirty-nine million, one hundred thirty-seven thousand, two hundred ninety-nine".