6855869 has 2 divisors, whose sum is σ = 6855870. Its totient is φ = 6855868.

The previous prime is 6855829. The next prime is 6855887. The reversal of 6855869 is 9685586.

It is a happy number.

6855869 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., 5943844 + 912025 = 2438^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 6855869 - 2¹² = 6851773 is a prime.

It is a super-2 number, since 2×6855869² = 94005879490322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6855809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3427934 + 3427935.

It is an arithmetic number, because the mean of its divisors is an integer number (3427935).

Almost surely, 2^6855869 is an apocalyptic number.

It is an amenable number.

6855869 is a deficient number, since it is larger than the sum of its proper divisors (1).

6855869 is an equidigital number, since it uses as much as digits as its factorization.

6855869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 47.

The square root of 6855869 is about 2618.3714404186. The cubic root of 6855869 is about 189.9710851659.

The spelling of 6855869 in words is "six million, eight hundred fifty-five thousand, eight hundred sixty-nine".