The number 9 is a natural number between 8 and 10. It is the square of 3 (3² = 9) and has various interesting mathematical properties. For example, the square of 9 is 81, its cube is 729, and it is the first odd composite number. In number theory, 9 is a precise power (9 = 3²). Also, any number's remainder when divided by 9 is equal to the remainder of the sum of its digits divided by 9. Moreover, 10^9 is known as a billion, where the SI prefix giga- (G) denotes 10^9 and nano- (n) denotes 10^-9.
Besides mathematics, 9 holds significance in numerology, representing concepts like helping, maturity, endings, love, ego, selflessness, and selfishness. It is often associated with creativity and the capacity to care for others, balancing ego with compassion.
There is also a 2009 animated film titled "9" which is an action-adventure.
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