43091 has 4 divisors (see below), whose sum is σ = 44184. Its totient is φ = 42000.

The previous prime is 43067. The next prime is 43093. The reversal of 43091 is 19034.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43091 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (43093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485 + ... + 566.

It is an arithmetic number, because the mean of its divisors is an integer number (11046).

2⁴³⁰⁹¹ is an apocalyptic number.

43091 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

43091 is a deficient number, since it is larger than the sum of its proper divisors (1093).

43091 is a wasteful number, since it uses less digits than its factorization.

43091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 43091 is about 207.5837180513. The cubic root of 43091 is about 35.0586770838.

The spelling of 43091 in words is "forty-three thousand, ninety-one".