680321689 has 2 divisors, whose sum is σ = 680321690. Its totient is φ = 680321688.

The previous prime is 680321639. The next prime is 680321717. The reversal of 680321689 is 986123086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655769664 + 24552025 = 25608^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 680321689 - 2⁷ = 680321561 is a prime.

It is not a weakly prime, because it can be changed into another prime (680321639) 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 as a sum of consecutive naturals, namely, 340160844 + 340160845.

It is an arithmetic number, because the mean of its divisors is an integer number (340160845).

Almost surely, 2^680321689 is an apocalyptic number.

It is an amenable number.

680321689 is a deficient number, since it is larger than the sum of its proper divisors (1).

680321689 is an equidigital number, since it uses as much as digits as its factorization.

680321689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 680321689 is about 26082.9769965010. The cubic root of 680321689 is about 879.5045803884.

The spelling of 680321689 in words is "six hundred eighty million, three hundred twenty-one thousand, six hundred eighty-nine".