They look like Garden Millipedes. They are fairly harmless to plants. They feed on decaying matter. Only time that plants may be injured is in the case of extreme dryness, when they may feed on roots.
I'd just let them be. If they bother you, you could scoop them out of the pot and dump them in the compost pile.
I have lots of them in my greenhouse and they never bother anything.
My Chinese Painted Quail love to eat them. Funny though, when I move a pot and the quail all come running, they only ever want whichever millipede the OTHER quail has! They will chase each other around, shredding one bug as they battle for it, while the other bugs escape unharmed. Bird brains!
Carolyn