639367097 has 2 divisors, whose sum is σ = 639367098. Its totient is φ = 639367096.

The previous prime is 639367073. The next prime is 639367111. The reversal of 639367097 is 790763936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495463081 + 143904016 = 22259^2 + 11996^2 .

It is a cyclic number.

It is not a de Polignac number, because 639367097 - 2⁸ = 639366841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (639360097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319683548 + 319683549.

It is an arithmetic number, because the mean of its divisors is an integer number (319683549).

Almost surely, 2^639367097 is an apocalyptic number.

It is an amenable number.

639367097 is a deficient number, since it is larger than the sum of its proper divisors (1).

639367097 is an equidigital number, since it uses as much as digits as its factorization.

639367097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1285956, while the sum is 50.

The square root of 639367097 is about 25285.7093434216. The cubic root of 639367097 is about 861.4897097832.

The spelling of 639367097 in words is "six hundred thirty-nine million, three hundred sixty-seven thousand, ninety-seven".