Over it are nineteen

 We have appointed none but angelic powers (universal laws) to be the keepers of the fire. and we assigned their number (19) 

    (1) to disturb the disbelievers, 

    (2) to convince the Christians and Jews (that this is a divine scripture), 

    (3) to strengthen the faith of the faithful, 

    (4) to remove all traces of doubt from the hearts of Christians, Jews, as well as the believers, and 

    (5) to expose those who harbor doubt in their hearts, and the disbelievers; they will say, "What did GOD mean by this allegory?" GOD thus sends astray whomever He wills, and guides whomever He wills. None knows the soldiers of your Lord except He. This is a reminder for the people.  

Quran: The Hidden Secret [74:30-31]

- The Basmala " بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ" consists of 19 letters. Every chapter in the quran starts with this verse except the chapter 9. It means In the name of God, The Most Gracious, The Dispenser of Grace.

- "Basmala" appears 114 times in the Quran, a multiple of 19.

- The first chapter revealed in the Quran was "The Clot العلق " consists of 19 verses.

- The first chapter consists of 76 words also a multiple of 19.

- The count of chapters in the Quran is a multiple of 19.

- The sum of chapters' numbers in the Quran is a multiple of 19.

- The sum of all digits mentioned in the Quran is a multiple of 19.

- The count of the word "Allah" in all the Quran is a multiple of 19.

- The sum of all verse numbers in which the word "Allah" appears is a multiple of 19.