43055561 has 2 divisors, whose sum is σ = 43055562. Its totient is φ = 43055560.

The previous prime is 43055491. The next prime is 43055567. The reversal of 43055561 is 16555034.

43055561 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 can be written as a sum of positive squares in only one way, i.e., 29365561 + 13690000 = 5419^2 + 3700^2 .

It is a cyclic number.

It is not a de Polignac number, because 43055561 - 2¹⁰ = 43054537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43055567) 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, 21527780 + 21527781.

It is an arithmetic number, because the mean of its divisors is an integer number (21527781).

Almost surely, 2^43055561 is an apocalyptic number.

It is an amenable number.

43055561 is a deficient number, since it is larger than the sum of its proper divisors (1).

43055561 is an equidigital number, since it uses as much as digits as its factorization.

43055561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 43055561 is about 6561.6736432102. The cubic root of 43055561 is about 350.4906343503.

The spelling of 43055561 in words is "forty-three million, fifty-five thousand, five hundred sixty-one".