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The Number 561561 is a Triangular Number. 561 is a Hexagonal Number. 561 is a 12-gonal Number. 561 is a 39-gonal Number. 561 is a 188-gonal Number. 561 is a Centered 20-gonal Number.
561 Ingwelde is a minor planet orbiting the Sun.
The Year 561 ADIn the year 561 AD Jnanagupta began translating Buddhist texts into Chinese.
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