Additionally, when any number is added to 9, that number is ‘brought to life’. For example, 3 + 9 = 12, and then the sum of the digits in the resulting number, 12, gives the same number back: 1 + 2 = 3.
Here, 9 symbolizes the Acharya, while 3 represents the seeker. If required, the Acharya willingly faces any difficulty to help the seekers attain Lord Srimannarayana. Sri Ramanujacharya has fully embodied this very nature of 9 in himself, willing to face the throes of Hell if millions of seekers could be uplifted.
Perhaps this is why the year of his appearance, 1017, adds up to 9 (1 + 0 + 1 + 7 = 9). The number of scriptures he graced is 9, and the number of times he traveled to seek the Mantra-ardha, i.e the meaning of the Narayana Ashtakshari mantra, was 18 times (1 + 8 = 9). Further details below...