6680981 has 2 divisors, whose sum is σ = 6680982. Its totient is φ = 6680980.

The previous prime is 6680977. The next prime is 6680987. The reversal of 6680981 is 1890866.

6680981 is digitally balanced in base 3, 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., 5958481 + 722500 = 2441^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 6680981 - 2² = 6680977 is a prime.

It is a super-2 number, since 2×6680981² = 89271014244722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6680987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340490 + 3340491.

It is an arithmetic number, because the mean of its divisors is an integer number (3340491).

Almost surely, 2^6680981 is an apocalyptic number.

It is an amenable number.

6680981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6680981 is an equidigital number, since it uses as much as digits as its factorization.

6680981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 6680981 is about 2584.7593698447. The cubic root of 6680981 is about 188.3418125158.

The spelling of 6680981 in words is "six million, six hundred eighty thousand, nine hundred eighty-one".