680609837 has 2 divisors, whose sum is σ = 680609838. Its totient is φ = 680609836.

The previous prime is 680609833. The next prime is 680609861. The reversal of 680609837 is 738906086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660798436 + 19811401 = 25706^2 + 4451^2 .

It is a cyclic number.

It is not a de Polignac number, because 680609837 - 2² = 680609833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 680609791 and 680609800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680609833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340304918 + 340304919.

It is an arithmetic number, because the mean of its divisors is an integer number (340304919).

Almost surely, 2^680609837 is an apocalyptic number.

It is an amenable number.

680609837 is a deficient number, since it is larger than the sum of its proper divisors (1).

680609837 is an equidigital number, since it uses as much as digits as its factorization.

680609837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 680609837 is about 26088.5000910363. The cubic root of 680609837 is about 879.6287332801.

The spelling of 680609837 in words is "six hundred eighty million, six hundred nine thousand, eight hundred thirty-seven".