9 (number)

9 < 8 | 10 >
0	1	2	3	4	5	6	7	8	9
10	11	12	13	14	15	16	17	18	19
20	21	22	23	24	25	26	27	28	29
30	31	32	33	34	35	36	37	38	39
40	41	42	43	44	45	46	47	48	49
50	51	52	53	54	55	56	57	58	59
60	61	62	63	64	65	66	67	68	69
70	71	72	73	74	75	76	77	78	79
80	81	82	83	84	85	86	87	88	89
90	91	92	93	94	95	96	97	98	99

9 (nine) is the integer the proceeds 8 and precedes 10 . The prime factorisation is 3^2. A number is divisible by 9 if the sum of the digits is divisible by 9. 9 is a Square number (i.e. $3^2=9$). 9 ones (1+1+1+1+1+1+1) 9+0 (The identity propety of addition),3*3, (9*1 and 1*9 with the Commutative Propety and the Identity Propety) and 3^2.but if including Decimals/Fraction/Mixed number/Percent,4.5*2/4½*2.

Properties

9 = 3².

The sum of the digits of any multiple of 9 is also a multiple of 9. For example: 126 -> 1+2+6 = 9; 136 -> 1+3+6 = 10. 126 is a multiple of 9, and 136 is not.