191155 has 4 divisors (see below), whose sum is σ = 229392. Its totient is φ = 152920.

The previous prime is 191143. The next prime is 191161. The reversal of 191155 is 551191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551191 = 17 ⋅32423.

It is not a de Polignac number, because 191155 - 2⁵ = 191123 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 19111 + ... + 19120.

It is an arithmetic number, because the mean of its divisors is an integer number (57348).

2¹⁹¹¹⁵⁵ is an apocalyptic number.

191155 is a deficient number, since it is larger than the sum of its proper divisors (38237).

191155 is an equidigital number, since it uses as much as digits as its factorization.

191155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38236.

The product of its digits is 225, while the sum is 22.

The square root of 191155 is about 437.2127628512. The cubic root of 191155 is about 57.6052263455.

It can be divided in two parts, 19 and 1155, that multiplied together give a triangular number (21945 = T₂₀₉).

The spelling of 191155 in words is "one hundred ninety-one thousand, one hundred fifty-five".