243

Number

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

$3^5$

$100 \, 000_3$

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:

$\map {\sigma_0} {242} = \map {\sigma_0} {243} = \map {\sigma_0} {244} = \map {\sigma_0} {245} = 6$

$\ds \map {\sigma_0} { 243 }$

$=$

$\ds 6$