191055 has 16 divisors (see below), whose sum is σ = 313344. Its totient is φ = 99360.

The previous prime is 191047. The next prime is 191057. The reversal of 191055 is 550191.

It is a happy number.

It is not a de Polignac number, because 191055 - 2³ = 191047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191057) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 570 + ... + 840.

It is an arithmetic number, because the mean of its divisors is an integer number (19584).

2¹⁹¹⁰⁵⁵ is an apocalyptic number.

191055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

191055 is a deficient number, since it is larger than the sum of its proper divisors (122289).

191055 is a wasteful number, since it uses less digits than its factorization.

191055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 191055 is about 437.0983870938. The cubic root of 191055 is about 57.5951794770.

It can be divided in two parts, 19105 and 5, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 191055 in words is "one hundred ninety-one thousand, fifty-five".