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Great. You are good then. Nothing to worry. Pagerank on those paginated pages is Good.

Thanks for your reply, Let me know if you are able to deindex those pages. I will wait. Also please share what you have implemented to deindex those pages.

Yea, no one.  And even if it is a niche directory, you still have to be careful I think.  Just because someone took their General directory and decided to split it out into 50 "niche" directories doesn't means it all of a sudden holds value. And I'm thinking the niche directories that have added real SEO benefit for me in the past, might not (to that extent) in the future.