The discrepancy is due to some people quoting the petrol engine power and others quoting the full hybrid system power level (engine+battery assistance).
The petrol engine is 98 bhp. For UK/Europe/US/most of Asia the engine is 2ZR-FXE.
For completeness, the Wiki entry linked to above is missing info about China, where it uses the 5ZR-FXE engine (used in both Prius and CT). It is almost identical to the 2ZR-FXE but don't get one of these.