91543 has 4 divisors (see below), whose sum is σ = 94528. Its totient is φ = 88560.

The previous prime is 91541. The next prime is 91571. The reversal of 91543 is 34519.

91543 is nontrivially palindromic in base 6.

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

It is a cyclic number.

It is not a de Polignac number, because 91543 - 2¹ = 91541 is a prime.

It is a Duffinian number.

91543 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91541) 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, 1446 + ... + 1507.

It is an arithmetic number, because the mean of its divisors is an integer number (23632).

2⁹¹⁵⁴³ is an apocalyptic number.

91543 is a deficient number, since it is larger than the sum of its proper divisors (2985).

91543 is a wasteful number, since it uses less digits than its factorization.

91543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2984.

The product of its digits is 540, while the sum is 22.

The square root of 91543 is about 302.5607377040. The cubic root of 91543 is about 45.0687016440.

The spelling of 91543 in words is "ninety-one thousand, five hundred forty-three".