639317297 has 2 divisors, whose sum is σ = 639317298. Its totient is φ = 639317296.

The previous prime is 639317281. The next prime is 639317423. The reversal of 639317297 is 792713936.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 534950641 + 104366656 = 23129^2 + 10216^2 .

It is a cyclic number.

It is not a de Polignac number, because 639317297 - 2⁴ = 639317281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (639317227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319658648 + 319658649.

It is an arithmetic number, because the mean of its divisors is an integer number (319658649).

Almost surely, 2^639317297 is an apocalyptic number.

It is an amenable number.

639317297 is a deficient number, since it is larger than the sum of its proper divisors (1).

639317297 is an equidigital number, since it uses as much as digits as its factorization.

639317297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 47.

The square root of 639317297 is about 25284.7245782903. The cubic root of 639317297 is about 861.4673421942.

The spelling of 639317297 in words is "six hundred thirty-nine million, three hundred seventeen thousand, two hundred ninety-seven".