Bergzivman, at first glance I thought a Gymnocalycium, but the more I look the more I see a Lobivia;). Sorry not much help, but that's how cactus can be. Sometimes you just have to wait to see what the flowers look like. In this case you would only have to wait for buds to make a ruling if it's a Gymno or not. Gymnocalycium buds have zero spines, fuzz or anything. They're just smooth with a scale pattern;). Very distinct.

Thank you. Do you know what kind of mammillaria?

The “nipple” type cactus are so hard to id. Most the time when I see cactus like this my brain goes straight to Mammillaria, but I see more Coryphantha in yours. There’s also Escobaria. Hopefully it’ll bloom fairly soon for you. If blooms come from the top you’ve got a Coryphantha or Escobaria, but if the flowers come from older side growth it’s a Mammillaria. I’ve read the only way a person can tell the difference between Escobaria and Coryphantha is the seeds.

Rina. Haha yes I know the flowers are fake, hot glued on , even tho when I bought the plant I thought they were real. I took them off.