680260309 has 2 divisors, whose sum is σ = 680260310. Its totient is φ = 680260308.

The previous prime is 680260297. The next prime is 680260319. The reversal of 680260309 is 903062086.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622652209 + 57608100 = 24953^2 + 7590^2 .

It is a cyclic number.

It is not a de Polignac number, because 680260309 - 2¹¹ = 680258261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680260319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340130154 + 340130155.

It is an arithmetic number, because the mean of its divisors is an integer number (340130155).

Almost surely, 2^680260309 is an apocalyptic number.

It is an amenable number.

680260309 is a deficient number, since it is larger than the sum of its proper divisors (1).

680260309 is an equidigital number, since it uses as much as digits as its factorization.

680260309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 680260309 is about 26081.8003404673. The cubic root of 680260309 is about 879.4781293650.

The spelling of 680260309 in words is "six hundred eighty million, two hundred sixty thousand, three hundred nine".