On December 25, 2004, the Huygens probe separated from the Cassini spacecraft orbiting Saturn and began a 22 day journey to Saturn's giant moon Titan (see the figure below <- just a picture of the planet), on whose surface it landed. It is useful to know that Titan is 1.22×10^6 from the center of Saturn and has a mass of 1.35×10^23 and a diameter of 5150 .
At what distance from Titan should the gravitational pull of Titan just balance the gravitational pull of Saturn?
(answer is in km)