639180701 has 6 divisors (see below), whose sum is σ = 640915002. Its totient is φ = 637451040.

The previous prime is 639180697. The next prime is 639180709. The reversal of 639180701 is 107081936.

It can be written as a sum of positive squares in 3 ways, for example, as 513067801 + 126112900 = 22651^2 + 11230^2 .

It is not a de Polignac number, because 639180701 - 2² = 639180697 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639180709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 165371 + ... + 169191.

It is an arithmetic number, because the mean of its divisors is an integer number (106819167).

Almost surely, 2^639180701 is an apocalyptic number.

It is an amenable number.

639180701 is a deficient number, since it is larger than the sum of its proper divisors (1734301).

639180701 is an frugal number, since it uses more digits than its factorization.

639180701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4639 (or 4230 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 639180701 is about 25282.0232774199. The cubic root of 639180701 is about 861.4059843597.

The spelling of 639180701 in words is "six hundred thirty-nine million, one hundred eighty thousand, seven hundred one".