1187

Number

$1187$ (one thousand, one hundred and eighty-seven) is:

The $7$th Stern number after $1$, $3$, $17$, $137$, $227$, $977$

The $7$th Stern prime after $1$, $3$, $17$, $137$, $227$, $977$

The $18$th balanced prime after $5$, $53$, $157$, $173$, $211$, $257$, $263$, $373$, $563$, $593$, $607$, $653$, $733$, $947$, $977$, $1103$, $1123$:

$1187 = \dfrac {1181 + 1193} 2$

The $27$th safe prime after $5$, $7$, $11$, $23$, $47$, $\ldots$, $479$, $503$, $563$, $587$, $719$, $839$, $863$, $887$, $983$, $1019$:

$1187 = 2 \times 553 + 1$