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The Number 1691: Properties and MeaningsPrime Factors of 1691=19x89.
1691 Oort is a main-belt asteroid discovered by Ingrid van Houten-Groeneveld and Karl Wilhelm Reinmuth at Heidelberg. It was named after the Dutch astronomer Jan Oort.
Aeroflot Flight 1691 crashed after a false fire warning near Moscow Vnukovo Airport.
The Year 1691 ADIn the year 1691 AD a fire at the Palace of Whitehall in London destroyed its Stone Gallery.
In the year 1691 AD Michel Rolle invented Rolle's theorem, an essential theorem of mathematics.
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