688319717 has 2 divisors, whose sum is σ = 688319718. Its totient is φ = 688319716.

The previous prime is 688319699. The next prime is 688319729. The reversal of 688319717 is 717913886.

688319717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599319361 + 89000356 = 24481^2 + 9434^2 .

It is a cyclic number.

It is not a de Polignac number, because 688319717 - 2⁸ = 688319461 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 (688319417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344159858 + 344159859.

It is an arithmetic number, because the mean of its divisors is an integer number (344159859).

Almost surely, 2^688319717 is an apocalyptic number.

It is an amenable number.

688319717 is a deficient number, since it is larger than the sum of its proper divisors (1).

688319717 is an equidigital number, since it uses as much as digits as its factorization.

688319717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 50.

The square root of 688319717 is about 26235.8479375072. The cubic root of 688319717 is about 882.9377186395.

The spelling of 688319717 in words is "six hundred eighty-eight million, three hundred nineteen thousand, seven hundred seventeen".