680999989 has 2 divisors, whose sum is σ = 680999990. Its totient is φ = 680999988.

The previous prime is 680999983. The next prime is 681000013. The reversal of 680999989 is 989999086.

680999989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648109764 + 32890225 = 25458^2 + 5735^2 .

It is a cyclic number.

It is not a de Polignac number, because 680999989 - 2³ = 680999981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680999981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340499994 + 340499995.

It is an arithmetic number, because the mean of its divisors is an integer number (340499995).

Almost surely, 2^680999989 is an apocalyptic number.

It is an amenable number.

680999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

680999989 is an equidigital number, since it uses as much as digits as its factorization.

680999989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22674816, while the sum is 67.

The square root of 680999989 is about 26095.9764906393. The cubic root of 680999989 is about 879.7967802949.

The spelling of 680999989 in words is "six hundred eighty million, nine hundred ninety-nine thousand, nine hundred eighty-nine".