243

Number
$243$ (two hundred and forty-three) is:


 * $3^5$


 * In ternary:
 * $100 \, 000_3$


 * The $3$rd fifth power after $1$, $32$:
 * $243 = 3 \times 3 \times 3 \times 3 \times 3$


 * The number of different binary operations with an identity element that can be applied to a set with $3$ elements


 * The $5$th power of $3$ after $(1)$, $3$, $9$, $27$, $81$:
 * $243 = 3^5$


 * The $26$th powerful number after $1$, $4$, $8$, $9$, $16$, $25$, $\ldots$, $108$, $121$, $125$, $128$, $144$, $169$, $196$, $200$, $216$, $225$


 * The $2$nd of the $7$th pair of consecutive integers which both have $6$ divisors:
 * $\map {\sigma_0} {242} = \map {\sigma_0} {243} = 6$


 * The $1$st of the $8$th pair of consecutive integers which both have $6$ divisors:
 * $\map {\sigma_0} {243} = \map {\sigma_0} {244} = 6$


 * The $2$nd of the $1$st quadruple of consecutive integers which all have an equal divisors:
 * $\map {\sigma_0} {242} = \map {\sigma_0} {243} = \map {\sigma_0} {244} = \map {\sigma_0} {245} = 6$