6819 has 4 divisors (see below), whose sum is σ = 9096. Its totient is φ = 4544.

The previous prime is 6803. The next prime is 6823. The reversal of 6819 is 9186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6819 - 2⁴ = 6803 is a prime.

It is a super-2 number, since 2×6819² = 92997522, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1134 + ... + 1139.

It is an arithmetic number, because the mean of its divisors is an integer number (2274).

2⁶⁸¹⁹ is an apocalyptic number.

6819 is a deficient number, since it is larger than the sum of its proper divisors (2277).

6819 is a wasteful number, since it uses less digits than its factorization.

6819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276.

The product of its digits is 432, while the sum is 24.

The square root of 6819 is about 82.5772365728. The cubic root of 6819 is about 18.9629935276.

The spelling of 6819 in words is "six thousand, eight hundred nineteen".