688109317 has 4 divisors (see below), whose sum is σ = 786410656. Its totient is φ = 589807980.

The previous prime is 688109309. The next prime is 688109369. The reversal of 688109317 is 713901886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 688109317 - 2³ = 688109309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688109117) 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 in 3 ways as a sum of consecutive naturals, for example, 49150659 + ... + 49150672.

It is an arithmetic number, because the mean of its divisors is an integer number (196602664).

Almost surely, 2^688109317 is an apocalyptic number.

It is an amenable number.

688109317 is a deficient number, since it is larger than the sum of its proper divisors (98301339).

688109317 is an equidigital number, since it uses as much as digits as its factorization.

688109317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98301338.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 688109317 is about 26231.8378502155. The cubic root of 688109317 is about 882.8477463863.

The spelling of 688109317 in words is "six hundred eighty-eight million, one hundred nine thousand, three hundred seventeen".