855116191 has 4 divisors (see below), whose sum is σ = 855406984. Its totient is φ = 854825400.

The previous prime is 855116173. The next prime is 855116203. The reversal of 855116191 is 191611558.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 855116191 - 2⁷ = 855116063 is a prime.

It is a super-2 number, since 2×855116191² = 1462447400220696962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 855116191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855116111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140940 + ... + 146881.

It is an arithmetic number, because the mean of its divisors is an integer number (213851746).

Almost surely, 2^855116191 is an apocalyptic number.

855116191 is a deficient number, since it is larger than the sum of its proper divisors (290793).

855116191 is a wasteful number, since it uses less digits than its factorization.

855116191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290792.

The product of its digits is 10800, while the sum is 37.

The square root of 855116191 is about 29242.3697911096. The cubic root of 855116191 is about 949.1649877868.

It can be divided in two parts, 8551 and 16191, that added together give a palindrome (24742).

The spelling of 855116191 in words is "eight hundred fifty-five million, one hundred sixteen thousand, one hundred ninety-one".