855191 has 2 divisors, whose sum is σ = 855192. Its totient is φ = 855190.

The previous prime is 855187. The next prime is 855199. The reversal of 855191 is 191558.

855191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855191 - 2² = 855187 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427595 + 427596.

It is an arithmetic number, because the mean of its divisors is an integer number (427596).

2⁸⁵⁵¹⁹¹ is an apocalyptic number.

855191 is a deficient number, since it is larger than the sum of its proper divisors (1).

855191 is an equidigital number, since it uses as much as digits as its factorization.

855191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 29.

The square root of 855191 is about 924.7653756494. The cubic root of 855191 is about 94.9192665902.

The spelling of 855191 in words is "eight hundred fifty-five thousand, one hundred ninety-one".