639123299 has 2 divisors, whose sum is σ = 639123300. Its totient is φ = 639123298.

The previous prime is 639123271. The next prime is 639123301. The reversal of 639123299 is 992321936.

639123299 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639123299 is a prime.

Together with 639123301, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (639123209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319561649 + 319561650.

It is an arithmetic number, because the mean of its divisors is an integer number (319561650).

Almost surely, 2^639123299 is an apocalyptic number.

639123299 is a deficient number, since it is larger than the sum of its proper divisors (1).

639123299 is an equidigital number, since it uses as much as digits as its factorization.

639123299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 44.

The square root of 639123299 is about 25280.8880184221. Note that the first 3 decimals coincide. The cubic root of 639123299 is about 861.3801972302.

The spelling of 639123299 in words is "six hundred thirty-nine million, one hundred twenty-three thousand, two hundred ninety-nine".