6853421 has 2 divisors, whose sum is σ = 6853422. Its totient is φ = 6853420.

The previous prime is 6853409. The next prime is 6853423. The reversal of 6853421 is 1243586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6817321 + 36100 = 2611^2 + 190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6853421 is a prime.

It is a Sophie Germain prime.

Together with 6853423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6853423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3426710 + 3426711.

It is an arithmetic number, because the mean of its divisors is an integer number (3426711).

Almost surely, 2^6853421 is an apocalyptic number.

It is an amenable number.

6853421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6853421 is an equidigital number, since it uses as much as digits as its factorization.

6853421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 6853421 is about 2617.9039325384. The cubic root of 6853421 is about 189.9484717146.

The spelling of 6853421 in words is "six million, eight hundred fifty-three thousand, four hundred twenty-one".