The number 1 is the symbol of unity.
Whereas odd numbers are usually male (and even numbers female) the number 1 is considered to be neither and both. Adding the number 1 to an even number creates an odd number. Adding the number 1 to an odd number creates an even number.
Personality traits of the number 1
The number 1 is associated with leadership and sometimes aggression. People associated with the number 1 are often independent, goal driven and likely to succeed.
Letter numeric values for the number 1
The letter A is equivalent with the number 1. The letters J and S are often also associated with the number 1.
Using the Chaldean method of number mapping the letters A, I, J, Q and Y are associated with the number 1.
In Cantonese Chinese numerology the number 1 means ‘sure’.
In Pure Spirit
What does the number 1 mean to you? Is it a number you associate with?

Depends on context. Top marks. Lonliness. Or selfishness (like 3 without a good balance of 6 and 9).
This is just my surmise and may not be correct for you.