43128817 has 2 divisors, whose sum is σ = 43128818. Its totient is φ = 43128816.

The previous prime is 43128809. The next prime is 43128857. The reversal of 43128817 is 71882134.

It is a happy number.

43128817 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 can be written as a sum of positive squares in only one way, i.e., 38638656 + 4490161 = 6216^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 43128817 - 2³ = 43128809 is a prime.

It is not a weakly prime, because it can be changed into another prime (43128857) 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, 21564408 + 21564409.

It is an arithmetic number, because the mean of its divisors is an integer number (21564409).

Almost surely, 2^43128817 is an apocalyptic number.

It is an amenable number.

43128817 is a deficient number, since it is larger than the sum of its proper divisors (1).

43128817 is an equidigital number, since it uses as much as digits as its factorization.

43128817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 43128817 is about 6567.2533832646. The cubic root of 43128817 is about 350.6893000848.

The spelling of 43128817 in words is "forty-three million, one hundred twenty-eight thousand, eight hundred seventeen".