4371

Number
$4371$ (four thousand, three hundred and seventy-one) is:


 * $3 \times 31 \times 47$


 * The $47$th hexagonal number after $1$, $6$, $15$, $28$, $45$, $66$, $91$, $\ldots$, $2145$, $2278$, $2415$, $2556$, $2701$, $2850$, $3003$, $3160$, $3321$, $3486$, $3655$, $3828$, $4005$, $4186$:
 * $4371 = \displaystyle \sum_{k \mathop = 1}^{47} \left({4 k - 3}\right) = 47 \left({2 \times 47 - 1}\right)$


 * The $15$th Poulet number after $341$, $561$, $645$, $1105$, $1387$, $1729$, $1905$, $2047$, $2465$, $2701$, $2821$, $3277$, $4033$, $4369$:
 * $2^{4371} \equiv 2 \pmod {4371}$: $4371 = 3 \times 31 \times 47$