What is the escape velocity2 compared to Earth?
It has a big atmosphere. About 10 times as much per square meter of surface as Earth. It is mostly nitrogen. How can that be, with so little gravity? It helps a lot that Titan is so cold, so the gas molecules aren't moving very fast. That makes it just possible for Titan to keep its atmosphere.
Still, I have not seen a convincing explanation of why Titan got so much atmosphere to start with. Presumably, there was a considerable amount of ammonia ice, NH3 in the original Titan. Then a little warming released ammonia gas into the atmosphere, where ultraviolet radiation from the sun broke it into nitrogen and hydrogen (which mostly escaped).