639106271 has 2 divisors, whose sum is σ = 639106272. Its totient is φ = 639106270.

The previous prime is 639106201. The next prime is 639106289. The reversal of 639106271 is 172601936.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639106271 is a prime.

It is a super-3 number, since 3×639106271³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639106201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319553135 + 319553136.

It is an arithmetic number, because the mean of its divisors is an integer number (319553136).

Almost surely, 2^639106271 is an apocalyptic number.

639106271 is a deficient number, since it is larger than the sum of its proper divisors (1).

639106271 is an equidigital number, since it uses as much as digits as its factorization.

639106271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 639106271 is about 25280.5512400343. The cubic root of 639106271 is about 861.3725473175.

The spelling of 639106271 in words is "six hundred thirty-nine million, one hundred six thousand, two hundred seventy-one".