6819641 has 2 divisors, whose sum is σ = 6819642. Its totient is φ = 6819640.

The previous prime is 6819629. The next prime is 6819649. The reversal of 6819641 is 1469186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4326400 + 2493241 = 2080^2 + 1579^2 .

It is a cyclic number.

It is not a de Polignac number, because 6819641 - 2¹⁴ = 6803257 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6819649) 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, 3409820 + 3409821.

It is an arithmetic number, because the mean of its divisors is an integer number (3409821).

Almost surely, 2^6819641 is an apocalyptic number.

It is an amenable number.

6819641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6819641 is an equidigital number, since it uses as much as digits as its factorization.

6819641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 6819641 is about 2611.4442364332. Note that the first 3 decimals coincide. The cubic root of 6819641 is about 189.6358769574.

The spelling of 6819641 in words is "six million, eight hundred nineteen thousand, six hundred forty-one".