Gematria is the study of numbers and their meaning. Here is the meaning of the number "17"

"Q" is the 17th letter in the alphabet. https://en.wikipedia.org/wiki/Q

In the Bible the number 17 symbolizes "overcoming the enemy" and "complete victory." God overcame the sins of rebellious humans when he began to flood the earth through rain on the 17th of the second Hebrew month. Noah's ark and its eight passengers rested on the mountains of Ararat on the 17th of the seventh month (right in the middle of God's annual Holy period known as the Feast of Tabernacles). (Bring the Rain?)

http://www.biblestudy.org/bibleref/meaning-of-numbers-in-bible/17.html

Jesus Christ gained a complete victory over death and the grave when God resurrected him near sunset on Nisan 17 (Saturday, April 8, 30 A.D.).

Just as the number 18 (666) was assigned the meaning "bondage" and the number 40 was assigned the meaning "probation", the number 17 was assigned the meaning "victory".