43541 has 2 divisors, whose sum is σ = 43542. Its totient is φ = 43540.

The previous prime is 43517. The next prime is 43543. The reversal of 43541 is 14534.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28900 + 14641 = 170^2 + 121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43541 is a prime.

It is a Sophie Germain prime.

Together with 43543, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43543) 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 as a sum of consecutive naturals, namely, 21770 + 21771.

It is an arithmetic number, because the mean of its divisors is an integer number (21771).

2⁴³⁵⁴¹ is an apocalyptic number.

It is an amenable number.

43541 is a deficient number, since it is larger than the sum of its proper divisors (1).

43541 is an equidigital number, since it uses as much as digits as its factorization.

43541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 17.

The square root of 43541 is about 208.6648029736. The cubic root of 43541 is about 35.1802941527.

The spelling of 43541 in words is "forty-three thousand, five hundred forty-one".