145 (number)
Natural number
From Wikipedia, the free encyclopedia
145 (one hundred [and] forty-five) is the natural number following 144 and preceding 146.
Cardinalone hundred forty-five
Ordinal145th
(one hundred forty-fifth)
(one hundred forty-fifth)
Factorization5 Ã 29
Divisors1, 5, 29, 145
| ||||
|---|---|---|---|---|
| Cardinal | one hundred forty-five | |||
| Ordinal | 145th (one hundred forty-fifth) | |||
| Factorization | 5 Ã 29 | |||
| Divisors | 1, 5, 29, 145 | |||
| Greek numeral | ΡÎδ | |||
| Roman numeral | CXLV, cxlv | |||
| Binary | 100100012 | |||
| Ternary | 121013 | |||
| Senary | 4016 | |||
| Octal | 2218 | |||
| Duodecimal | 10112 | |||
| Hexadecimal | 9116 | |||
In mathematics
- Although composite, 145 is a Fermat pseudoprime in sixteen bases with b < 145. In four of those bases, it is a strong pseudoprime: 1, 12, 17, and 144.
- The Mertens function returns 0.[1]
- 145 is a pentagonal number[2] and a centered square number.[3]
- . 145 is the fourth number that is the sum of two different pairs of squares. Also, 145 is the result of 34 + 43, making it a Leyland number.
- , making it a factorion.[4] The only other numbers that have this property are 1, 2 and 40585.[4]
- , making 145 the smallest number that can be written as the sum of a square number and a factorial in 3 ways. The next number with this property is 46249.[5]
