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Wolfram|Alpha, developed by Wolfram Alpha, is touted as a "computational engine" to cater for your factual search queries.
Scientific, mathematical, socio-economic, biographical, cultural and linguistic data is curated by the software -- rather than algorithms used by Google or Bing -- and turns general English queries into algebra, calculus, physics and engineering algorithms.
Wolfram|Alpha began a partnership with Apple in the past several years, and the inclusion of Siri has induced a rise in popularity for the application.
This app is compatible with the iPhone, iPod touch, and iPad. Requires iOS 5.0 or later.
Download: Apple App Store