680809117 has 4 divisors (see below), whose sum is σ = 682984540. Its totient is φ = 678633696.

The previous prime is 680809111. The next prime is 680809127. The reversal of 680809117 is 711908086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23707161 + 657101956 = 4869^2 + 25634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680809117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 680809117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680809111) 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, 1087242 + ... + 1087867.

It is an arithmetic number, because the mean of its divisors is an integer number (170746135).

Almost surely, 2^680809117 is an apocalyptic number.

It is an amenable number.

680809117 is a deficient number, since it is larger than the sum of its proper divisors (2175423).

680809117 is a wasteful number, since it uses less digits than its factorization.

680809117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175422.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 680809117 is about 26092.3191188518. The cubic root of 680809117 is about 879.7145755639.

The spelling of 680809117 in words is "six hundred eighty million, eight hundred nine thousand, one hundred seventeen".