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Natural number From Wikipedia, the free encyclopedia
261 (two hundred [and] sixty-one) is the natural number following 260 and preceding 262. It has the prime factorization 32·29.
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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 |
There are 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 nonagonal number, unique period in base 2, and the number of possible unfolded tesseract patterns.
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]