1,787,109,376

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Number

$1 \, 787 \, 109 \, 376$ is:

$2^{13} \times 13 \times 97 \times 173$

The $18$th automorphic number after $1$, $5$, $6$, $25$, $76$, $376$, $625$, $9376$, $\ldots$, $12 \, 890 \, 625$, $87 \, 109 \, 376$, $212 \, 890 \, 625$, $787 \, 109 \, 376$:

$1 \, 787 \, 109 \, 376^2 = 3 \, 193 \, 759 \, 92 \, \mathbf {1 \, 787 \, 109 \, 376}$

and the $1$st of the only $2$ such with $10$ digits.

Also see

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Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $1,787,109,376$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1,787,109,376$