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# 145 (number)

 Cardinal One hundred [and] forty five Ordinal 145th Factorization $5 \cdot 29$ 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