639350771 has 2 divisors, whose sum is σ = 639350772. Its totient is φ = 639350770.

The previous prime is 639350759. The next prime is 639350809. The reversal of 639350771 is 177053936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639350771 - 2¹⁴ = 639334387 is a prime.

It is a Chen prime.

It is equal to p_33268478 and since 639350771 and 33268478 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (639359771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319675385 + 319675386.

It is an arithmetic number, because the mean of its divisors is an integer number (319675386).

Almost surely, 2^639350771 is an apocalyptic number.

639350771 is a deficient number, since it is larger than the sum of its proper divisors (1).

639350771 is an equidigital number, since it uses as much as digits as its factorization.

639350771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119070, while the sum is 41.

The square root of 639350771 is about 25285.3865107892. The cubic root of 639350771 is about 861.4823771149.

The spelling of 639350771 in words is "six hundred thirty-nine million, three hundred fifty thousand, seven hundred seventy-one".