191
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Number
$191$ (one hundred and ninety-one) is:
- The $43$rd prime number
- The $6$th Thabit number after $(2)$, $5$, $11$, $23$, $47$, $95$:
- $191 = 3 \times 2^6 - 1$
- The $6$th Thabit prime after $2$, $5$, $11$, $23$, $47$:
- $191 = 3 \times 2^6 - 1$
- The $6$th near-repdigit prime after $101$, $113$, $131$, $151$, $181$
- The $10$th palindromic prime:
- $2$, $3$, $5$, $7$, $11$, $101$, $131$, $151$, $181$, $191$, $\ldots$
- The $13$th prime number after $53$, $71$, $103$, $107$, $109$, $149$, $151$, $157$, $163$, $167$, $173$, $181$ which cannot be expressed as either the sum of or the difference between a power of $2$ and a power of $3$
- The smaller of the $14$th pair of twin primes, with $193$
- The $15$th Sophie Germain prime after $2$, $3$, $5$, $11$, $23$, $29$, $41$, $53$, $83$, $89$, $113$, $131$, $173$, $179$:
- $2 \times 191 + 1 = 383$, which is prime
Also see
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