639705301 has 2 divisors, whose sum is σ = 639705302. Its totient is φ = 639705300.

The previous prime is 639705299. The next prime is 639705307. The reversal of 639705301 is 103507936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406990276 + 232715025 = 20174^2 + 15255^2 .

It is a cyclic number.

It is not a de Polignac number, because 639705301 - 2¹ = 639705299 is a prime.

Together with 639705299, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639705307) 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, 319852650 + 319852651.

It is an arithmetic number, because the mean of its divisors is an integer number (319852651).

Almost surely, 2^639705301 is an apocalyptic number.

It is an amenable number.

639705301 is a deficient number, since it is larger than the sum of its proper divisors (1).

639705301 is an equidigital number, since it uses as much as digits as its factorization.

639705301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 34.

The square root of 639705301 is about 25292.3961102937. The cubic root of 639705301 is about 861.6415828408.

The spelling of 639705301 in words is "six hundred thirty-nine million, seven hundred five thousand, three hundred one".