43561109 has 2 divisors, whose sum is σ = 43561110. Its totient is φ = 43561108.

The previous prime is 43561097. The next prime is 43561117. The reversal of 43561109 is 90116534.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33814225 + 9746884 = 5815^2 + 3122^2 .

It is a cyclic number.

It is not a de Polignac number, because 43561109 - 2⁴ = 43561093 is a prime.

It is a Sophie Germain prime.

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 (43561159) 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 as a sum of consecutive naturals, namely, 21780554 + 21780555.

It is an arithmetic number, because the mean of its divisors is an integer number (21780555).

Almost surely, 2^43561109 is an apocalyptic number.

It is an amenable number.

43561109 is a deficient number, since it is larger than the sum of its proper divisors (1).

43561109 is an equidigital number, since it uses as much as digits as its factorization.

43561109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 43561109 is about 6600.0840146168. The cubic root of 43561109 is about 351.8570921482.

The spelling of 43561109 in words is "forty-three million, five hundred sixty-one thousand, one hundred nine".