680917 has 2 divisors, whose sum is σ = 680918. Its totient is φ = 680916.

The previous prime is 680881. The next prime is 680929. The reversal of 680917 is 719086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 463761 + 217156 = 681^2 + 466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340458 + 340459.

It is an arithmetic number, because the mean of its divisors is an integer number (340459).

2⁶⁸⁰⁹¹⁷ is an apocalyptic number.

It is an amenable number.

680917 is a deficient number, since it is larger than the sum of its proper divisors (1).

680917 is an equidigital number, since it uses as much as digits as its factorization.

680917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 680917 is about 825.1769507203. The cubic root of 680917 is about 87.9761040490.

The spelling of 680917 in words is "six hundred eighty thousand, nine hundred seventeen".