It was revealed in Mecca, it is thirty passages long, consisting of three hundred and thirty words and one thousand three hundred letters. (Tafsir Al-Khateeb Al-Sharabini Vol .3 P.367.)

Ibn Shihab said that is it known as 'the disputer' as it disputes with those of the grave! (Ibid) Those of the grave meaning the two angels Munkar and Nakir who question the servant after they are buried and their relatives have gone.

All of the Quran is blessed and parts of the Quran we have been informed about their specific blessing and others we have not. One such Surah that we have been informed about its blessing is Surah Mulk.
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