680672249 has 2 divisors, whose sum is σ = 680672250. Its totient is φ = 680672248.

The previous prime is 680672219. The next prime is 680672309. The reversal of 680672249 is 942276086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401281024 + 279391225 = 20032^2 + 16715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680672249 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (680672219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340336124 + 340336125.

It is an arithmetic number, because the mean of its divisors is an integer number (340336125).

Almost surely, 2^680672249 is an apocalyptic number.

It is an amenable number.

680672249 is a deficient number, since it is larger than the sum of its proper divisors (1).

680672249 is an equidigital number, since it uses as much as digits as its factorization.

680672249 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 44.

The square root of 680672249 is about 26089.6962228386. The cubic root of 680672249 is about 879.6556198101.

The spelling of 680672249 in words is "six hundred eighty million, six hundred seventy-two thousand, two hundred forty-nine".