How many people knew Bitcoin in 2009 and how much was it worth in 2009?
I did not know about BTC back in 2009 and talking about its price back 2009, not sure because there was no exchange at that time where we could trade BTC like we can trade now, but to be sure it you have to read the
following thread where the first BTC trade were made, and the laszlo ho sold his 10 BTC just for 2 pizza was the first guy ever, and at that time, the price of 2 pizza like maybe around $40 the thing is after reading the thread you will see the trade happened in 2010 which means till 2010 there was no price for BTC.
I might be wrong here, but after that trade in 2010 things started to change and BTC started to get value.
If someone bought Bitcoin in 2009, is that buyer rich now?
Of course, he will be rich, but I don't think that in 2009 there was any BTC trade might happened because only miners were making BTC.
Bitcoin now stands at 26,893 and was it lower in 2009?
Yes, it was lower.