Divisors of the Positive Integer 81

1, 3, 9, 27, 81

Sum of all the Divisors of 81, including itself

121

Sum of the Proper Divisors of 81

40

Properties of the number 81

The integer 81 is an odd number.
The integer 81 is a Composite number.
40 is less than 81, so 81 is a deficient number.

The number 81 as a Roman Numeral

LXXXI

The number 81 in various Numeral Systems

Base	Representation
2:	1010001
3:	10000
4:	1101
5:	311
6:	213
7:	144
8:	121
9:	100
10:	81
11:	74
12:	69
13:	63
14:	5B
15:	56
16:	51
17:	4D
18:	49
19:	45
20:	41
21:	3I
22:	3F
23:	3C
24:	39
25:	36
26:	33
27:	30
28:	2P
29:	2N
30:	2L
31:	2J
32:	2H
33:	2F
34:	2D
35:	2B
36:	29