680261789 has 2 divisors, whose sum is σ = 680261790. Its totient is φ = 680261788.

The previous prime is 680261779. The next prime is 680261801. The reversal of 680261789 is 987162086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487968100 + 192293689 = 22090^2 + 13867^2 .

It is a cyclic number.

It is not a de Polignac number, because 680261789 - 2⁴ = 680261773 is a prime.

It is a super-2 number, since 2×680261789² = 925512203146961042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680261719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340130894 + 340130895.

It is an arithmetic number, because the mean of its divisors is an integer number (340130895).

Almost surely, 2^680261789 is an apocalyptic number.

It is an amenable number.

680261789 is a deficient number, since it is larger than the sum of its proper divisors (1).

680261789 is an equidigital number, since it uses as much as digits as its factorization.

680261789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 680261789 is about 26081.8287127264. The cubic root of 680261789 is about 879.4787671732.

The spelling of 680261789 in words is "six hundred eighty million, two hundred sixty-one thousand, seven hundred eighty-nine".