No, it requires 51. 51 is more than 49, you know. Gives you the ability to control committees, calendars, and all sorts of neat stuff that have to do with controlling the levers of power. Republicans held it from 1995-2007, with a few brief interruptions to do idiots like Jeffords. To say 60 is required for a majority means there has only been on majority party, for about six months, in our lifetimes, and Harry Reid currently controls nothing. Sort of a silly thing to assert.
Controlling the legislative agenda is one thing. Passing legislation is quite another. In the Senate you are going to need 60 votes to do that, and if you don’t do that it does not matter how many committees you control.