91 waa tiro dabiici ah (natural number) oo ku taal kala dambaynta tirooyinka ka dib 90 kana hor 92. Waa tiro isku-dhis ah (composite), taas oo la micno ah in ay leedahay qaybiyeyaal ka badan 1 iyo naftiisa: 91 = 7 × 13. Qaybiyeyaasheeda oo dhan waa 1, 7, 13 iyo 91.

Marka la qoro habka tobanle, 91 waa laba god (two-digit). Nidaamka labeeyaha (binary) waxay ku qoran tahay 1011011, halka Tirooyinka Roomaanka lagu muujiyo XCI.

Sifooyin xisaabeed

91 waa tiro saddex-xagalle ah (triangular number): waa isu-geynta tirooyinka 1 ilaa 13, taasoo ah 13 × 14 ÷ 2 = 91. Sidoo kale waa tiro buundo-labajibbaaran (square pyramidal number), maxaa yeelay waxay la mid tahay isu-geynta labajibbaarrada ugu horreeya lix: 1 + 4 + 9 + 16 + 25 + 36 = 91. Waxay kaloo ka mid tahay tirooyinka lix-xagalka (hexagonal numbers).

91 waxay caan ku tahay in ay tusaale u tahay tiro isku-dhis ah oo si fudud loo malayn karo mid asal ah (prime). Ma qaybsanto 2, 3, 5 midna, sidaas darteed marka la eego imtixaanno degdeg ah way u eg tahay tiro asal ah, in kasta oo 7 ay qaybiso. Waxay sidoo kale tusaale u tahay tirooyinka lagu tijaabiyo imtixaannada asalnimada ee ku salaysan xeerka Fermat.

Isticmaal kale

Meelo badan oo ka baxsan xisaabta ayaa tiradan loo isticmaalaa astaan ahaan. Tusaale ahaan, jadwalka curiyeyaasha kiimikada, lambarka atamiga 91 wuxuu u taagan yahay burootaktiiniyamka (protactinium). Nidaamka lambarrada telefoonka caalamiga ah, 91 waa kood-dalka Hindiya.

XusuusinEreyada "tiro asal ah" (prime) iyo "tiro isku-dhis ah" (composite) waxay kala saaraan tirooyinka kaliya laba qaybiye leh iyo kuwa ka badan. Turjumaadda erey-bixinta xisaabeed ee Af-Soomaaliga way kala duwan tahay ilo ilo.

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