191543 has 6 divisors (see below), whose sum is σ = 210672. Its totient is φ = 174020.

The previous prime is 191537. The next prime is 191551. The reversal of 191543 is 345191.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-191543 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191533) 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 5 ways as a sum of consecutive naturals, for example, 671 + ... + 912.

It is an arithmetic number, because the mean of its divisors is an integer number (35112).

2¹⁹¹⁵⁴³ is an apocalyptic number.

191543 is a deficient number, since it is larger than the sum of its proper divisors (19129).

191543 is a wasteful number, since it uses less digits than its factorization.

191543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605 (or 1594 counting only the distinct ones).

The product of its digits is 540, while the sum is 23.

The square root of 191543 is about 437.6562578097. The cubic root of 191543 is about 57.6441750564.

The spelling of 191543 in words is "one hundred ninety-one thousand, five hundred forty-three".