6942209 has 2 divisors, whose sum is σ = 6942210. Its totient is φ = 6942208.

The previous prime is 6942197. The next prime is 6942211. The reversal of 6942209 is 9022496.

6942209 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., 5303809 + 1638400 = 2303^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 6942209 - 2⁸ = 6941953 is a prime.

It is a Sophie Germain prime.

Together with 6942211, 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 (6942269) 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, 3471104 + 3471105.

It is an arithmetic number, because the mean of its divisors is an integer number (3471105).

Almost surely, 2^6942209 is an apocalyptic number.

It is an amenable number.

6942209 is a deficient number, since it is larger than the sum of its proper divisors (1).

6942209 is an equidigital number, since it uses as much as digits as its factorization.

6942209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6942209 is about 2634.8072035730. The cubic root of 6942209 is about 190.7652333345.

The spelling of 6942209 in words is "six million, nine hundred forty-two thousand, two hundred nine".