43591 has 2 divisors, whose sum is σ = 43592. Its totient is φ = 43590.

The previous prime is 43579. The next prime is 43597. The reversal of 43591 is 19534.

43591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43591 - 2¹¹ = 41543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21795 + 21796.

It is an arithmetic number, because the mean of its divisors is an integer number (21796).

2⁴³⁵⁹¹ is an apocalyptic number.

43591 is a deficient number, since it is larger than the sum of its proper divisors (1).

43591 is an equidigital number, since it uses as much as digits as its factorization.

43591 is an evil number, because the sum of its binary digits is even.

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

The square root of 43591 is about 208.7845779745. The cubic root of 43591 is about 35.1937553488.

The spelling of 43591 in words is "forty-three thousand, five hundred ninety-one".