$***($numbers $1-3)$Titan$,$ one of Saturn's moons, is the $2$nd largest moon in our solar system. It has a mass of $1\mathrm{.}35$ x $1023$ kg and a radius of $2\mathrm{.}58$ x $106$ m$.***$

Titan's surface gravity, the rate at which objects accelerate near its surface, is $\_\_\_\_\_\_$ m$/$s$2.$