Gulfstream G700 Captain reported multiple system caution and warnings. Crew diverted and landed uneventfully.

Narrative

During descent into ZZZ on the ZZZZZ arrival; speed approximately 285kts and slowing; altitude approximately 25000 ft a Master Caution Right Main Gear not Up Illuminated. Autothrottles also disconnected; and over speed warning activated. Malfunction was diagnosed using synoptic page as well as video cameras and then the appropriate checklist items were carried out. As part of the checklist; the landing gear was lowered. As the speed decreased due to the increased drag of the gear; PF attempted to apply power but throttles were stuck in the idle position. Lowered nose to maintain speed while at the same time applied significant pressure to throttles which eventually came off the idle position. Due to the increased fuel consumption with gear extended; the uncertainty of gear integrity; and the stuck throttles; crew decided to request priority handling and divert to an airport with a longer runway than intended destination.ZZZ1 was selected taking into account runway length; proximity and the availability of Gulfstream technical support. Crew declared intention of diverting to ZZZ1 but were denied due to VIP movement at said airport. Upon further crew discussion it was decided to divert to ZZZ2.As a further precaution; crew requested Crash Fire Rescue (CFR) to be on standby for landing ZZZ2. Landing was uneventful and CFR stood down.