6683921 has 2 divisors, whose sum is σ = 6683922. Its totient is φ = 6683920.

The previous prime is 6683903. The next prime is 6683927. The reversal of 6683921 is 1293866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6553600 + 130321 = 2560^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 6683921 - 2¹⁸ = 6421777 is a prime.

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 (6683927) 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, 3341960 + 3341961.

It is an arithmetic number, because the mean of its divisors is an integer number (3341961).

Almost surely, 2^6683921 is an apocalyptic number.

It is an amenable number.

6683921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6683921 is an equidigital number, since it uses as much as digits as its factorization.

6683921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 6683921 is about 2585.3280256091. The cubic root of 6683921 is about 188.3694353916.

The spelling of 6683921 in words is "six million, six hundred eighty-three thousand, nine hundred twenty-one".