145 (number) Guide, Meaning , Facts, Information and Description
| Cardinal | One hundred [and] forty five |
| Ordinal | 145th |
| Factorization | |
| Roman numeral | CXLV |
| Binary | 10010001 |
| Hexadecimal | 91 |
Although composite, 145 is a pseudoprime.
Given 145, the Mertens function returns 0.
145 is a pentagonal number and a centered square number.
. 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 is the fourth number that is the sum of two different pairs of squares.
For the year 145 AD, see 145.
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