191143 has 2 divisors, whose sum is σ = 191144. Its totient is φ = 191142.

The previous prime is 191141. The next prime is 191161. The reversal of 191143 is 341191.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (341191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191143 - 2¹ = 191141 is a prime.

Together with 191141, it forms a pair of twin primes.

191143 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 191143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191141) 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 as a sum of consecutive naturals, namely, 95571 + 95572.

It is an arithmetic number, because the mean of its divisors is an integer number (95572).

2¹⁹¹¹⁴³ is an apocalyptic number.

191143 is a deficient number, since it is larger than the sum of its proper divisors (1).

191143 is an equidigital number, since it uses as much as digits as its factorization.

191143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 19.

The square root of 191143 is about 437.1990393402. The cubic root of 191143 is about 57.6040209063.

The spelling of 191143 in words is "one hundred ninety-one thousand, one hundred forty-three".