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- 225_(number) abstract "225 (two hundred [and] twenty five) is the natural number following 224 and preceding 226.225 is the smallest number that is a polygonal number in five different ways. It is a square number (225 = 152),an octagonal number, and a squared triangular number (225 = (1 + 2 + 3 + 4 + 5)2 = 13 + 23 + 33 + 43 + 53) .As the square of a double factorial, 225 = 5!!2 counts the number of permutations of six items in which all cycles have even length, or the number of permutations in which all cycles have odd length. And as one of the Stirling numbers of the first kind, it counts the number of permutations of six items with exactly three cycles.225 is a highly composite odd number, meaning that it has more divisors than any smaller odd numbers. After 1 and 9, 225 is the third smallest number n for which σ(φ(n)) = φ(σ(n)), where σ is the sum of divisors function and φ is Euler's totient function.225 is the smallest square number to have one of every digit in some number base (225 is 3201 in base 4)".
- 225_(number) wikiPageID "2538401".
- 225_(number) wikiPageLength "2100".
- 225_(number) wikiPageOutDegree "12".
- 225_(number) wikiPageRevisionID "663073553".
- 225_(number) wikiPageWikiLink Category:Integers.
- 225_(number) wikiPageWikiLink Divisor_function.
- 225_(number) wikiPageWikiLink Double_factorial.
- 225_(number) wikiPageWikiLink Eulers_totient_function.
- 225_(number) wikiPageWikiLink Highly_composite_number.
- 225_(number) wikiPageWikiLink Octagonal_number.
- 225_(number) wikiPageWikiLink Permutation.
- 225_(number) wikiPageWikiLink Polygonal_number.
- 225_(number) wikiPageWikiLink Square_number.
- 225_(number) wikiPageWikiLink Squared_triangular_number.
- 225_(number) wikiPageWikiLink Stirling_numbers_of_the_first_kind.
- 225_(number) wikiPageWikiLinkText "225 (number)".
- 225_(number) wikiPageWikiLinkText "225".
- 225_(number) hasPhotoCollection 225_(number).
- 225_(number) number "225".
- 225_(number) prime "no".
- 225_(number) wikiPageUsesTemplate Template:Infobox_number.
- 225_(number) wikiPageUsesTemplate Template:Reflist.
- 225_(number) subject Category:Integers.
- 225_(number) hypernym Number.
- 225_(number) comment "225 (two hundred [and] twenty five) is the natural number following 224 and preceding 226.225 is the smallest number that is a polygonal number in five different ways.".
- 225_(number) label "225 (number)".
- 225_(number) sameAs 225_(عدد).
- 225_(number) sameAs 225_(ədəd).
- 225_(number) sameAs 225_(число).
- 225_(number) sameAs Berrehun_eta_hogeita_bost.
- 225_(number) sameAs ۲۲۵_(عدد).
- 225_(number) sameAs 225_(nombre).
- 225_(number) sameAs 225_(nonm).
- 225_(number) sameAs 225_(szám).
- 225_(number) sameAs 225_(angka).
- 225_(number) sameAs 225_(numero).
- 225_(number) sameAs 225.
- 225_(number) sameAs 225.
- 225_(number) sameAs 225_(број).
- 225_(number) sameAs 225_(nombor).
- 225_(number) sameAs 225_(число).
- 225_(number) sameAs 225_(tal).
- 225_(number) sameAs 225_(сан).
- 225_(number) sameAs 225_(число).
- 225_(number) sameAs Q857154.
- 225_(number) sameAs Q857154.
- 225_(number) sameAs 225.
- 225_(number) wasDerivedFrom 225_(number)?oldid=663073553.
- 225_(number) isPrimaryTopicOf 225_(number).