I can't wait to get swole on that planet.
All DBZ jokes aside, this planet would probably not be livable for humans due to the gravitational force. 4.5 times Earth gravity is probably the limit for a human body. That 4.5g limit is only doable for a small number of top strongman athletes that can walk with a ridiculous number of weight on top of them. At 5g an athlete at that elite level wouldn't be able to stand up. 3 to 4g would be possible for "normal" humans if given the proper training.
For those interested in this information, oddly enough our skeletal structure is completely fine with the stress of high gravity. In fact the human skeleton is theorized to be able to handle more than 90 times Earth gravity. There's a catch with that figure. That's only if someone was simply standing. As soon as the body has to move, the stress on the bones would be increased by a factor of 10! Theoretically if a human had the inhuman muscles required for that gravity, a human could potentially run at 9g without straight up breaking. At 10g (remember 90g was the limit but you have to add the factor of 10 due to stress from skeletal movement) the athlete's bones would start to crack.
This is a research paper on this topic.