| Nominal | 12991 |
| Cardinal | twelve thousand nine hundred ninety-one |
Cardinal twelve thousand nine hundred ninety-one | |
| Ordinal | 12,991st |
| Number of digits | 5 |
| Sum of digits | 22 |
| Product of digits | 162 |
| Number parity | Odd |
| Prime factorization | 11 x 1181 |
| Prime factors | 11, 1181 |
| Number of distinct prime factors ω(n) | 2 |
| Total number of prime factors Ω(n) | 2 |
| Sum of prime factors | 1192 |
| Product of prime factors | 12991 |
| Is 12991 a prime number? | No |
| Is 12991 a semiprime number? | Yes |
| Is 12991 a Chen prime number? | No |
| Is 12991 a Mersenne prime number? | No |
| Is 12991 a Catalan number? | No |
| Is 12991 a Fibonacci number? | No |
| Is 12991 a Idoneal number? | No |
| Square of 12991 (n2) | 168766081 |
| Cube of 12991 (n3) | 2192440158271 |
| Square root of 12991 | 113.97806806575 |
| Natural Logarithm (ln) of 12991 | 9.4720120889957 |
| Decimal Logarithm (log) of 12991 | 4.1136425827717 |
| Sine of 12991 | -0.49199291476342 |
| Cosecant of 12991 | -2.032549595721 |
| Cosine of 12991 | -0.87059920274636 |
| Secant of 12991 | -1.1486341784434 |
| Tangent of 12991 | 0.56511987744923 |
| Cotangent of 12991 | 1.7695360575772 |
| The spelling of 12991 in words is "twelve thousand nine hundred ninety-one", meaning that: |
| 12991 is not an aban number (as it contains the letter a) |
| 12991 is not an eban number (as it contains the letter e) |
| 12991 is not an iban number (as it contains the letter i) |
| 12991 is not an oban number (as it contains the letter o) |
| 12991 is not a tban number (as it contains the letter t) |
| 12991 is not an uban number (as it contains the letter u) |
| Bengali numerals | ১২৯৯১ |
| Eastern Arabic numerals | ١٢٬٩٩١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓆼𓆼𓍪𓎎𓏺 |
| Khmer numerals | ១២៩៩១ |
| Japanese numerals | 一万二千九百九十一 |
| Roman numerals | n/a |
| Thai numerals | ๑๒๙๙๑ |
| Arabic | إثنا عشر ألف و تسعة مائة و واحد و تسعون |
| Croatian | dvanaest tisuća devetsto devedeset i jedan |
| Czech | dvanáct tisíc devět set devadesát jeden |
| Danish | tolv tusinde ni hundrede en og halvfems |
| Dutch | twaalfduizend negenhonderdéénennegentig |
| Estonian | akpe wuieve alafa asieke blaasieke vɔ ɖekɛ |
| Faroese | tólv tusin og níggjuhundraðognítiein |
| Filipino | labíng-dalawáng libó’t siyám na daán at siyám na pû’t isá |
| Finnish | kaksitoistatuhattayhdeksänsataayhdeksänkymmentäyksi |
| French | douze mille neuf cent quatre-vingt-onze |
| Greek | δώδεκα χίλιάδες εννιακόσια εννενήντα ένα |
| German | zwölftausendneunhunderteinundneunzig |
| Hebrew | שניים עשר אלף תשע מאות תשעים ואחת |
| Hindi | बारह हज़ार नौ सौ इक्यानबे |
| Hungarian | tizenkettőezerkilencszázkilencvenegy |
| Icelandic | tólf þúsund og níuhundrað og níutíu og einn |
| Indonesian | dua belas ribu sembilan ratus sembilan puluh satu |
| Italian | dodicimilanovecentonovantuno |
| Japanese | 一万二千九百九十一 |
| Korean | 만 이천구백구십일 |
| Latvian | divpadsmit tūkstoši deviņsimt deviņdesmit viens |
| Lithuanian | dvylika tūkstančių devyni šimtai devyniasdešimt vienas |
| Norwegian | tolv tusen ni hundre og nittién |
| Persian | دوازده هزار و نهصد و نود و یک |
| Polish | dwanaście tysięcy dziewięćset dziewięćdziesiąt jeden |
| Portuguese | doze mil novecentos e noventa e um |
| Romanian | douăsprezece mii nouă sute nouăzeci şi unu |
| Russian | двенадцать тысяч девятьсот девяносто один |
| Serbian | дванаест хиљада деветсто деведесет и један |
| Slovak | dvanásť tisíc deväťsto deväťdesiatjeden |
| Slovene | dvanajst tisuću devetsto devetdeset ena |
| Spanish | doce mil novecientos noventa y uno |
| Swahili | elfu kumi na mbili, mia tisa na tisini na moja |
| Swedish | tolvtusenniohundranittioen |
| Thai | หนึ่งหมื่นสองพันเก้าร้อยเก้าสิบเอ็ด |
| Turkish | on iki bin dokuz yüz doksan bir |
| Ukrainian | дванадцять тисяч девʼятсот девʼяносто один |
| Vietnamese | mười hai nghìn chín trăm chín mươi mốt |
| Number 12991 reversed | 19921 | |
| Unicode Character | U+32BF | ㊿ |
| Unix Timestamp | Thu, 01 Jan 1970 03:36:31 +0000 | |