543891 has 4 divisors (see below), whose sum is σ = 725192. Its totient is φ = 362592.

The previous prime is 543889. The next prime is 543901. The reversal of 543891 is 198345.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 543891 - 2¹ = 543889 is a prime.

It is a D-number.

It is a Duffinian number.

543891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (543811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90646 + ... + 90651.

It is an arithmetic number, because the mean of its divisors is an integer number (181298).

2⁵⁴³⁸⁹¹ is an apocalyptic number.

543891 is a deficient number, since it is larger than the sum of its proper divisors (181301).

543891 is a wasteful number, since it uses less digits than its factorization.

543891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181300.

The product of its digits is 4320, while the sum is 30.

The square root of 543891 is about 737.4896609445. The cubic root of 543891 is about 81.6276494633.

The spelling of 543891 in words is "five hundred forty-three thousand, eight hundred ninety-one".