6866191 has 2 divisors, whose sum is σ = 6866192. Its totient is φ = 6866190.

The previous prime is 6866177. The next prime is 6866257. The reversal of 6866191 is 1916686.

6866191 = T₂₁₃₈ + T₂₁₃₉ + T₂₁₄₀.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6866191 - 2⁹ = 6865679 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6866191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6866131) 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, 3433095 + 3433096.

It is an arithmetic number, because the mean of its divisors is an integer number (3433096).

Almost surely, 2^6866191 is an apocalyptic number.

6866191 is the 2140-th centered triangular number.

6866191 is a deficient number, since it is larger than the sum of its proper divisors (1).

6866191 is an equidigital number, since it uses as much as digits as its factorization.

6866191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 6866191 is about 2620.3417716016. The cubic root of 6866191 is about 190.0663757012.

The spelling of 6866191 in words is "six million, eight hundred sixty-six thousand, one hundred ninety-one".