Yes this number is from 911 operator.
Last night I accidentally called 911 last night and this number called me so I anwsered it it said "You called 911 recently " and I said it was an accident so they asked me couple questions then I was free to go. Remember don't hang up like I did when you accidentally call 911 don't hang up if you dothey will call you back and if you missed it they will send police, ambulance and firetrucks to your house.
So don't play with 911 calls

Just got two calls from this number on my cell this afternoon.  It went to voice mail and a female voice said it was 911 calling - that my cell had called them and to stay on the line if I needed help.  According to my call log its total BS.  This is either a collector going to previously unheard of nastiness or a real a***ole scammer.

This number was left on our answering machine. Due to privacy reasons, cannot return call.

My phone is Huawei and it has dedicated button which can press itself and it is for 911. And I got a call from this number so that is definitely the 911 number.No show in call log.

I just got call from this #. It isn't collector. It is really 911 center. I dial 112 because someone told me it would work for emergency in any part of the word even if I dial 112 when my phone is locked. I tested and yes it is true. If you dial 112 any time even out of your area with locked phone you get connected with 911. Cool!

This number is genuinely from 911 emergency. Some cell phones do not store 911 calls in their call logs so be carefully with the emergency call buttons (i.e., blackberry lock screen)