191 (number)
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Article Images191 (one hundred [and] ninety-one) is the natural number following 190 and preceding 192.
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Cardinal | one hundred ninety-one | |||
Ordinal | 191st (one hundred ninety-first) | |||
Factorization | prime | |||
Prime | yes | |||
Greek numeral | ΡϞΑ´ | |||
Roman numeral | CXCI | |||
Binary | 101111112 | |||
Ternary | 210023 | |||
Senary | 5156 | |||
Octal | 2778 | |||
Duodecimal | 13B12 | |||
Hexadecimal | BF16 |
In mathematics
191 is a prime number, part of a prime quadruplet of four primes: 191, 193, 197, and 199. Because doubling and adding one produces another prime number (383), 191 is a Sophie Germain prime. It is the smallest prime that is not a full reptend prime in any base from 2 to 10 – in fact the smallest base for which 191 is a full period prime is base 19.[1]
See also
References
- ^ Wolfram MathWorld; Primitive Root
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