639069701 has 2 divisors, whose sum is σ = 639069702. Its totient is φ = 639069700.

The previous prime is 639069689. The next prime is 639069709. The reversal of 639069701 is 107960936.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360012676 + 279057025 = 18974^2 + 16705^2 .

It is a cyclic number.

It is not a de Polignac number, because 639069701 - 2⁶ = 639069637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639069709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319534850 + 319534851.

It is an arithmetic number, because the mean of its divisors is an integer number (319534851).

Almost surely, 2^639069701 is an apocalyptic number.

It is an amenable number.

639069701 is a deficient number, since it is larger than the sum of its proper divisors (1).

639069701 is an equidigital number, since it uses as much as digits as its factorization.

639069701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 639069701 is about 25279.8279464082. The cubic root of 639069701 is about 861.3561176060.

The spelling of 639069701 in words is "six hundred thirty-nine million, sixty-nine thousand, seven hundred one".