43541681 has 4 divisors (see below), whose sum is σ = 43570164. Its totient is φ = 43513200.

The previous prime is 43541669. The next prime is 43541683. The reversal of 43541681 is 18614534.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14554225 + 28987456 = 3815^2 + 5384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43541681 is a prime.

It is a super-2 number, since 2×43541681² = 3791755968611522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43541683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11810 + ... + 15051.

It is an arithmetic number, because the mean of its divisors is an integer number (10892541).

Almost surely, 2^43541681 is an apocalyptic number.

It is an amenable number.

43541681 is a deficient number, since it is larger than the sum of its proper divisors (28483).

43541681 is a wasteful number, since it uses less digits than its factorization.

43541681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28482.

The product of its digits is 11520, while the sum is 32.

The square root of 43541681 is about 6598.6120510301. The cubic root of 43541681 is about 351.8047756343.

The spelling of 43541681 in words is "forty-three million, five hundred forty-one thousand, six hundred eighty-one".