6704921 has 2 divisors, whose sum is σ = 6704922. Its totient is φ = 6704920.

The previous prime is 6704909. The next prime is 6704923. The reversal of 6704921 is 1294076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6553600 + 151321 = 2560^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 6704921 - 2⁶ = 6704857 is a prime.

It is a Sophie Germain prime.

Together with 6704923, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6704923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3352460 + 3352461.

It is an arithmetic number, because the mean of its divisors is an integer number (3352461).

Almost surely, 2^6704921 is an apocalyptic number.

It is an amenable number.

6704921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6704921 is an equidigital number, since it uses as much as digits as its factorization.

6704921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 6704921 is about 2589.3862207095. The cubic root of 6704921 is about 188.5665064689.

Adding to 6704921 its reverse (1294076), we get a palindrome (7998997).

The spelling of 6704921 in words is "six million, seven hundred four thousand, nine hundred twenty-one".