Science Fair Project Encyclopedia
145 (number)
| Cardinal | One hundred [and] forty five |
| Ordinal | 145th |
| Factorization | 
|
| Roman numeral | CXLV |
| Binary | 10010001 |
| Hexadecimal | 91 |
145 is the natural number following 144 and preceding 146 .
Although composite, 145 is a pseudoprime.
Given 145, the Mertens function returns 0.
145 is a pentagonal number and a centered square number.
145 = 1! + 4! + 5!. The only other numbers that have the property that they are the sum of the factorials of their digits are 1, 2 and 40585 .
145 = 122 + 12 = 82 + 92. 145 is the fourth number that is the sum of two different pairs of squares.
For the year 145 AD, see 145.
Last updated: 09-11-2005 21:23:00
03-10-2013 05:06:04
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details