688388317 has 2 divisors, whose sum is σ = 688388318. Its totient is φ = 688388316.

The previous prime is 688388299. The next prime is 688388353. The reversal of 688388317 is 713883886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 684659556 + 3728761 = 26166^2 + 1931^2 .

It is a cyclic number.

It is not a de Polignac number, because 688388317 - 2¹⁹ = 687864029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688388357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344194158 + 344194159.

It is an arithmetic number, because the mean of its divisors is an integer number (344194159).

Almost surely, 2^688388317 is an apocalyptic number.

It is an amenable number.

688388317 is a deficient number, since it is larger than the sum of its proper divisors (1).

688388317 is an equidigital number, since it uses as much as digits as its factorization.

688388317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 52.

The square root of 688388317 is about 26237.1552764396. The cubic root of 688388317 is about 882.9670497356.

The spelling of 688388317 in words is "six hundred eighty-eight million, three hundred eighty-eight thousand, three hundred seventeen".