The answers you seek in regards to the amount of coins that are in circulation now can be found here:
https://coinmarketcap.com/currencies/solaris/ --- That number will go up as more coins are mined so that's why you saw 999,000 at one point and then 1,000,187 etc...
the total amount of coins that will ever exist is 10,000,000. < old algorithm > new algorithm has infinite supply as illustrated here:

You can read allot about Solaris on the first post of this thread as well as on the website.