81,081

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Number

$81 \, 081$ (eighty-one thousand and eighty-one) is:

$3^4 \times 7 \times 11 \times 13$

The $1$st odd abundant number which does not have $5$ as a prime factor:

$\map {\sigma_1} {81 \, 081} - 81 \, 081 = 81 \, 543 > 81 \, 081$

Arithmetic Functions on $81 \, 081$

\(\ds \map {\sigma_1} { 81 \, 081 }\)

\(=\)

\(\ds 162 \, 624\)

$\sigma_1$ of $81 \, 081$

Also see

• Next: Sequence of Odd Abundant Numbers without 5 as Factor

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $81,081$