680609009 has 2 divisors, whose sum is σ = 680609010. Its totient is φ = 680609008.

The previous prime is 680608993. The next prime is 680609071. The reversal of 680609009 is 900906086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 407434225 + 273174784 = 20185^2 + 16528^2 .

It is a cyclic number.

It is not a de Polignac number, because 680609009 - 2⁴ = 680608993 is a prime.

It is not a weakly prime, because it can be changed into another prime (680609099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340304504 + 340304505.

It is an arithmetic number, because the mean of its divisors is an integer number (340304505).

Almost surely, 2^680609009 is an apocalyptic number.

It is an amenable number.

680609009 is a deficient number, since it is larger than the sum of its proper divisors (1).

680609009 is an equidigital number, since it uses as much as digits as its factorization.

680609009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 680609009 is about 26088.4842219704. The cubic root of 680609009 is about 879.6283765741.

The spelling of 680609009 in words is "six hundred eighty million, six hundred nine thousand, nine".