855811187 has 16 divisors (see below), whose sum is σ = 1080499200. Its totient is φ = 658419840.

The previous prime is 855811181. The next prime is 855811207. The reversal of 855811187 is 781118558.

It is a cyclic number.

It is not a de Polignac number, because 855811187 - 2¹⁶ = 855745651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855811181) 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 in 15 ways as a sum of consecutive naturals, for example, 64262 + ... + 76427.

It is an arithmetic number, because the mean of its divisors is an integer number (67531200).

Almost surely, 2^855811187 is an apocalyptic number.

855811187 is a deficient number, since it is larger than the sum of its proper divisors (224688013).

855811187 is a wasteful number, since it uses less digits than its factorization.

855811187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140786.

The product of its digits is 89600, while the sum is 44.

The square root of 855811187 is about 29254.2507509593. The cubic root of 855811187 is about 949.4220628849.

It can be divided in two parts, 85581 and 1187, that added together give a palindrome (86768).

The spelling of 855811187 in words is "eight hundred fifty-five million, eight hundred eleven thousand, one hundred eighty-seven".