There are many benefits to memorizing this Surah. Requesting Allah’s protection from Shaytan is just one. Coupled with Surah Al-Falaq, they are both also known as the Surahs of Refuge, since they both begin with “Say: ‘I seek refuge in the Lord…’”
http://www.mounthira.com/learning/surah/114-an-nas/

There are many benefits to memorizing this Surah. Requesting Allah’s protection from Shaytan is just one. Coupled with Surah Al-Falaq, they are both also known as the Surahs of Refuge, since they both begin with “Say: ‘I seek refuge in the Lord…’”

http://www.mounthira.com/learning/surah/114-an-nas/