Numeric Value: 561

The folowing table expresses '561' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.

BaseDR10DR9DR8DR7DR6DR5DR4DR3DR2DR1
21000110001      100 1
3    202210   21,101
4     20301  123
5      4221 14,101
6      2333 15,101
7      1431 123
8      1061 101
9       68318,101
10       561123
11       470101
12       3A91AB
13       342 9
14       2C1112
15       276101
16       231 6

Math World

Factors: 3 * 11 * 17

561 is in the Pythagorean Triples: (400, 561, 689), (561, 1240, 1361).

561 is the sum of the counting numbers from 1 to 33 (See 'The Sum/Product of the First N Counting Numbers').