4243440217 has 2 divisors, whose sum is σ = 4243440218. Its totient is φ = 4243440216.

The previous prime is 4243440209. The next prime is 4243440367. The reversal of 4243440217 is 7120443424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3340377616 + 903062601 = 57796^2 + 30051^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243440217 - 2³ = 4243440209 is a prime.

It is not a weakly prime, because it can be changed into another prime (4243441217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121720108 + 2121720109.

It is an arithmetic number, because the mean of its divisors is an integer number (2121720109).

Almost surely, 2^4243440217 is an apocalyptic number.

It is an amenable number.

4243440217 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243440217 is an equidigital number, since it uses as much as digits as its factorization.

4243440217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 31.

The square root of 4243440217 is about 65141.6933844984. The cubic root of 4243440217 is about 1618.9720930556.

The spelling of 4243440217 in words is "four billion, two hundred forty-three million, four hundred forty thousand, two hundred seventeen".