6813689 has 2 divisors, whose sum is σ = 6813690. Its totient is φ = 6813688.

The previous prime is 6813683. The next prime is 6813691. The reversal of 6813689 is 9863186.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5721664 + 1092025 = 2392^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 6813689 - 2⁴ = 6813673 is a prime.

It is a Sophie Germain prime.

Together with 6813691, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6813683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3406844 + 3406845.

It is an arithmetic number, because the mean of its divisors is an integer number (3406845).

Almost surely, 2^6813689 is an apocalyptic number.

It is an amenable number.

6813689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6813689 is an equidigital number, since it uses as much as digits as its factorization.

6813689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 6813689 is about 2610.3043883808. The cubic root of 6813689 is about 189.5806911948.

The spelling of 6813689 in words is "six million, eight hundred thirteen thousand, six hundred eighty-nine".