6604681 has 2 divisors, whose sum is σ = 6604682. Its totient is φ = 6604680.

The previous prime is 6604673. The next prime is 6604691. The reversal of 6604681 is 1864066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5359225 + 1245456 = 2315^2 + 1116^2 .

It is a cyclic number.

It is not a de Polignac number, because 6604681 - 2³ = 6604673 is a prime.

It is a super-2 number, since 2×6604681² = 87243622223522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6604651) 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, 3302340 + 3302341.

It is an arithmetic number, because the mean of its divisors is an integer number (3302341).

Almost surely, 2^6604681 is an apocalyptic number.

It is an amenable number.

6604681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6604681 is an equidigital number, since it uses as much as digits as its factorization.

6604681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 6604681 is about 2569.9573926429. The cubic root of 6604681 is about 187.6220810884.

The spelling of 6604681 in words is "six million, six hundred four thousand, six hundred eighty-one".