6688481 has 2 divisors, whose sum is σ = 6688482. Its totient is φ = 6688480.

The previous prime is 6688471. The next prime is 6688499. The reversal of 6688481 is 1848866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5564881 + 1123600 = 2359^2 + 1060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6688481 is a prime.

It is a super-2 number, since 2×6688481² = 89471556174722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6688411) 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, 3344240 + 3344241.

It is an arithmetic number, because the mean of its divisors is an integer number (3344241).

Almost surely, 2^6688481 is an apocalyptic number.

It is an amenable number.

6688481 is a deficient number, since it is larger than the sum of its proper divisors (1).

6688481 is an equidigital number, since it uses as much as digits as its factorization.

6688481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 41.

The square root of 6688481 is about 2586.2097749409. The cubic root of 6688481 is about 188.4122630154.

The spelling of 6688481 in words is "six million, six hundred eighty-eight thousand, four hundred eighty-one".