43561643 has 2 divisors, whose sum is σ = 43561644. Its totient is φ = 43561642.

The previous prime is 43561607. The next prime is 43561681. The reversal of 43561643 is 34616534.

43561643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43561643 - 2⁶ = 43561579 is a prime.

It is not a weakly prime, because it can be changed into another prime (43563643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21780821 + 21780822.

It is an arithmetic number, because the mean of its divisors is an integer number (21780822).

Almost surely, 2^43561643 is an apocalyptic number.

43561643 is a deficient number, since it is larger than the sum of its proper divisors (1).

43561643 is an equidigital number, since it uses as much as digits as its factorization.

43561643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 32.

The square root of 43561643 is about 6600.1244685233. The cubic root of 43561643 is about 351.8585299056.

The spelling of 43561643 in words is "forty-three million, five hundred sixty-one thousand, six hundred forty-three".