191116811 has 8 divisors (see below), whose sum is σ = 196269744. Its totient is φ = 185996160.

The previous prime is 191116789. The next prime is 191116823. The reversal of 191116811 is 118611191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191116811 - 2⁶ = 191116747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191116411) 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 7 ways as a sum of consecutive naturals, for example, 4175 + ... + 19991.

It is an arithmetic number, because the mean of its divisors is an integer number (24533718).

Almost surely, 2^191116811 is an apocalyptic number.

191116811 is a deficient number, since it is larger than the sum of its proper divisors (5152933).

191116811 is a wasteful number, since it uses less digits than its factorization.

191116811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16141.

The product of its digits is 432, while the sum is 29.

The square root of 191116811 is about 13824.5003888025. The cubic root of 191116811 is about 576.0138996051.

The spelling of 191116811 in words is "one hundred ninety-one million, one hundred sixteen thousand, eight hundred eleven".