145 (number)
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| Template:Numbers 100-200 | |
| Cardinal | One hundred [and] forty five |
| Ordinal | 145th |
| Factorization | <math> 5 \cdot 29 <math> |
| 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.
<math>145 = 1! + 4! + 5!<math>. The only other numbers that have the property that they are the sum of the factorials of their digits are 1, 2 and 40585.
<math>145 = 12^2 + 1^2 = 8^2 + 9^2<math>. 145 is the fourth number that is the sum of two different pairs of squares.
For the year 145 AD, see 145.fr:145 (nombre) ko:145 sl:145 (število) zh:145