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 $2$nd of the $1$st quadruple of consecutive integers which all have an equal divisors:
 * $\tau \left({242}\right) = \tau \left({243}\right) = \tau \left({244}\right) = \tau \left({245}\right) = 6$