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is a [[prime number]].<ref>{{Cite OEIS|A002234|name=Numbers n such that the Woodall number n*2^n - 1 is prime}}</ref>
115 is the sum of the first five [[heptagonal numbers]].
==In science==
* The [[atomic number]] of the element [[moscovium]], formerly called ununpentium.
==In other fields==
'''115''' is also the fire service emergency number in [[Mauritius]]<ref>{{citation|title=CultureShock! Mauritius: A Survival Guide to Customs and Etiquette|first=Roseline Ng|last=Cheong-Lum|publisher=Marshall Cavendish International Asia Pte Ltd|year=2009|isbn=9789814435604|page=287|url=https://books.google.com/books?id=WR6JAAAAQBAJ&pg=PA287}}.</ref> and [[Italy]],<ref>{{citation|title=DK Eyewitness Travel Guide: Italy|publisher=Penguin|year=2013|isbn=9781465414946|page=619|url=https://books.google.com/books?id=HavTAAAAQBAJ&pg=PA619}}.</ref>
and the ambulance emergency number in [[Vietnam]].<ref>{{citation|title=The Rough Guide to Southeast Asia On A Budget|publisher=Penguin|year=2014|isbn=9780241012727|page=1286|url=https://books.google.com/books?id=kVE8BAAAQBAJ&pg=PT1286}}.</ref>
==See also==
* [[115 (disambiguation)]]
* [[List of highways numbered 115]]
==References==
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