Divisors of the Positive Integer 1981

1, 7, 283, 1981

Sum of all the Divisors of 1981, including itself

2272

Sum of the Proper Divisors of 1981

291

Properties of the number 1981

The integer 1981 is an odd number.
The integer 1981 is a Composite number.
291 is less than 1981, so 1981 is a deficient number.

The number 1981 as a Roman Numeral

MCMLXXXI

The number 1981 in various Numeral Systems

Base Representation
2:11110111101
3:2201101
4:132331
5:30411
6:13101
7:5530
8:3675
9:2641
10:1981
11:1541
12:1191
13:B95
14:A17
15:8C1
16:7BD
17:6E9
18:621
19:595
20:4J1
21:4A7
22:421
23:3H3
24:3AD
25:346
26:2O5
27:2JA
28:2EL
29:2A9
30:261
31:21S
32:1TT
33:1R1
34:1O9
35:1LL
36:1J1