6686213 has 2 divisors, whose sum is σ = 6686214. Its totient is φ = 6686212.

The previous prime is 6686203. The next prime is 6686221. The reversal of 6686213 is 3126866.

6686213 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4068289 + 2617924 = 2017^2 + 1618^2 .

It is a cyclic number.

It is not a de Polignac number, because 6686213 - 2¹⁸ = 6424069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6686213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6686203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343106 + 3343107.

It is an arithmetic number, because the mean of its divisors is an integer number (3343107).

Almost surely, 2^6686213 is an apocalyptic number.

It is an amenable number.

6686213 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686213 is an equidigital number, since it uses as much as digits as its factorization.

6686213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 6686213 is about 2585.7712582516. The cubic root of 6686213 is about 188.3909643417.

The spelling of 6686213 in words is "six million, six hundred eighty-six thousand, two hundred thirteen".