145 (Number)

CardinalOne hundred and
forty five
Ordinal145th
Factorization 5 \cdot 29
Roman numeralCXLV
Binary10010001
Hexadecimal91
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 = 12^2 + 1^2 = 8^2 + 9^2. 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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