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Cardinal | two hundred sixty-one | |||
Ordinal | 261st (two hundred sixty-first) | |||
Factorization | 32 × 29 | |||
Divisors | 1, 3, 9, 29, 87, 261 | |||
Greek numeral | ΣΞΑ´ | |||
Roman numeral | CCLXI | |||
Binary | 1000001012 | |||
Ternary | 1002003 | |||
Senary | 11136 | |||
Octal | 4058 | |||
Duodecimal | 19912 | |||
Hexadecimal | 10516 |
261 (two hundred [and] sixty-one) is a natural number proceeded by the number 260 and followed by 262. It has the prime factorization 32·29.
Mathematical properties
There are only six divisors of this number, the divisors being 1, 3, 9, 29, 87, and 261 itself.[1] 261 is a deficient number, since 1+3+9+29+87=129<261.
261 is a lucky number, as well as an odious number, meaning it has an odd number of 1's in its binary expansion, which is 1000001012 (with 3 ones in it).[2]
In other fields
261 may refer to...
The years 261 AD or 261 BC.
The steam locomotive Milwaukee Road 261.
References
Category:Articles created via the Article Wizard Category:Integers
- ^ "Facts about the number 261". Numbermatics - the number explorer. Retrieved 2017-03-20.
- ^ "Number Gossip: 261". www.numbergossip.com. Retrieved 2017-03-20.