Is my first overclock safe?

Good temps but with that kind of voltage it'd shorten the life of the processor by a bit.
 
Not enough for it to die before he upgrades to something bigger/better.
 
You did not say what you are using to cool the CPU, just make sure you keep a eye on the temperature when Prime95 is running.
 
If it can run prime95 for 24 hours or so, am I ok?
Yes. Your CPU voltage is also below 1.5V, so you aren't damaging it. It would be pertinent to see your load temps though, since idle temps aren't really significant.
 
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