6855491 has 2 divisors, whose sum is σ = 6855492. Its totient is φ = 6855490.

The previous prime is 6855481. The next prime is 6855493. The reversal of 6855491 is 1945586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6855491 is a prime.

Together with 6855493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6855493) 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, 3427745 + 3427746.

It is an arithmetic number, because the mean of its divisors is an integer number (3427746).

Almost surely, 2^6855491 is an apocalyptic number.

6855491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6855491 is an equidigital number, since it uses as much as digits as its factorization.

6855491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 38.

The square root of 6855491 is about 2618.2992571515. The cubic root of 6855491 is about 189.9675937344.

The spelling of 6855491 in words is "six million, eight hundred fifty-five thousand, four hundred ninety-one".