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191 (number) : ウィキペディア英語版 | 191 (number)
191 (one hundred () ninety-one) is the natural number following 190 and preceding 192. ==In mathematics==
* 191 is an odd number * 191 is a centered 19-gonal number * 191 is a deficient number, as 1 is less than 191 * 191 is a lazy caterer, number of slices a circle can be made into (19 slices can divide 191 pieces) * 191 is an odious number * 191 is a prime number * * Chen prime * * Eisenstein prime with no imaginary part * * Gaussian prime * * Palindromic prime, in base 10 * * Part of a prime quadruplet of four primes: 191, 193, 197, and 199 * * Sophie Germain prime * * Strong prime * * Twin prime that differs from another prime number (193) by 2 * 191 is a square-free number * 191 is a Thabit number * 191 is an undulating number * The binary number of 191 has seven 1 digits, but just one zero (10111111)
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