639788141 has 2 divisors, whose sum is σ = 639788142. Its totient is φ = 639788140.

The previous prime is 639788119. The next prime is 639788161. The reversal of 639788141 is 141887936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504182116 + 135606025 = 22454^2 + 11645^2 .

It is a cyclic number.

It is not a de Polignac number, because 639788141 - 2⁶ = 639788077 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 (639788161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319894070 + 319894071.

It is an arithmetic number, because the mean of its divisors is an integer number (319894071).

Almost surely, 2^639788141 is an apocalyptic number.

It is an amenable number.

639788141 is a deficient number, since it is larger than the sum of its proper divisors (1).

639788141 is an equidigital number, since it uses as much as digits as its factorization.

639788141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 639788141 is about 25294.0337036227. The cubic root of 639788141 is about 861.6787746059.

The spelling of 639788141 in words is "six hundred thirty-nine million, seven hundred eighty-eight thousand, one hundred forty-one".