680569 has 2 divisors, whose sum is σ = 680570. Its totient is φ = 680568.

The previous prime is 680567. The next prime is 680587. The reversal of 680569 is 965086.

680569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660969 + 19600 = 813^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 680569 - 2¹ = 680567 is a prime.

It is a super-2 number, since 2×680569² = 926348327522, which contains 22 as substring.

Together with 680567, it forms a pair of twin primes.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is not a weakly prime, because it can be changed into another prime (680567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340284 + 340285.

It is an arithmetic number, because the mean of its divisors is an integer number (340285).

2⁶⁸⁰⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

680569 is a deficient number, since it is larger than the sum of its proper divisors (1).

680569 is an equidigital number, since it uses as much as digits as its factorization.

680569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 680569 is about 824.9660599079. The cubic root of 680569 is about 87.9611140177.

The spelling of 680569 in words is "six hundred eighty thousand, five hundred sixty-nine".