43666001 has 2 divisors, whose sum is σ = 43666002. Its totient is φ = 43666000.

The previous prime is 43665931. The next prime is 43666039. The reversal of 43666001 is 10066634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36590401 + 7075600 = 6049^2 + 2660^2 .

It is a cyclic number.

It is not a de Polignac number, because 43666001 - 2¹⁰ = 43664977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43666061) 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, 21833000 + 21833001.

It is an arithmetic number, because the mean of its divisors is an integer number (21833001).

Almost surely, 2^43666001 is an apocalyptic number.

It is an amenable number.

43666001 is a deficient number, since it is larger than the sum of its proper divisors (1).

43666001 is an equidigital number, since it uses as much as digits as its factorization.

43666001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 43666001 is about 6608.0254993455. The cubic root of 43666001 is about 352.1392812491.

The spelling of 43666001 in words is "forty-three million, six hundred sixty-six thousand, one".