| Nominal | 13991 |
| Cardinal | thirteen thousand nine hundred ninety-one |
Cardinal thirteen thousand nine hundred ninety-one | |
| Ordinal | 13,991st |
| Number of digits | 5 |
| Sum of digits | 23 |
| Product of digits | 243 |
| Number parity | Odd |
| Prime factorization | 17 x 823 |
| Prime factors | 17, 823 |
| Number of distinct prime factors ω(n) | 2 |
| Total number of prime factors Ω(n) | 2 |
| Sum of prime factors | 840 |
| Product of prime factors | 13991 |
| Is 13991 a prime number? | No |
| Is 13991 a semiprime number? | Yes |
| Is 13991 a Chen prime number? | No |
| Is 13991 a Mersenne prime number? | No |
| Is 13991 a Catalan number? | No |
| Is 13991 a Fibonacci number? | No |
| Is 13991 a Idoneal number? | No |
| Square of 13991 (n2) | 195748081 |
| Cube of 13991 (n3) | 2738711401271 |
| Square root of 13991 | 118.28355760629 |
| Natural Logarithm (ln) of 13991 | 9.5461695447333 |
| Decimal Logarithm (log) of 13991 | 4.1458487565905 |
| Sine of 13991 | -0.99656718970066 |
| Cosecant of 13991 | -1.0034446350781 |
| Cosine of 13991 | -0.082787900155344 |
| Secant of 13991 | -12.079059839948 |
| Tangent of 13991 | 12.037594718923 |
| Cotangent of 13991 | 0.083073074260262 |
| The spelling of 13991 in words is "thirteen thousand nine hundred ninety-one", meaning that: |
| 13991 is not an aban number (as it contains the letter a) |
| 13991 is not an eban number (as it contains the letter e) |
| 13991 is not an iban number (as it contains the letter i) |
| 13991 is not an oban number (as it contains the letter o) |
| 13991 is not a tban number (as it contains the letter t) |
| 13991 is not an uban number (as it contains the letter u) |
| Bengali numerals | ১৩৯৯১ |
| Eastern Arabic numerals | ١٣٬٩٩١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓆼𓆼𓆼𓍪𓎎𓏺 |
| Khmer numerals | ១៣៩៩១ |
| Japanese numerals | 一万三千九百九十一 |
| Roman numerals | n/a |
| Thai numerals | ๑๓๙๙๑ |
| Arabic | ثلاثة عشر ألف و تسعة مائة و واحد و تسعون |
| Croatian | trinaest tisuća devetsto devedeset i jedan |
| Czech | třináct tisíc devět set devadesát jeden |
| Danish | tretten tusinde ni hundrede en og halvfems |
| Dutch | dertienduizend negenhonderdéénennegentig |
| Estonian | akpe wuietɔ̃ alafa asieke blaasieke vɔ ɖekɛ |
| Faroese | trettan tusin og níggjuhundraðognítiein |
| Filipino | labíng-tatlóng libó’t siyám na daán at siyám na pû’t isá |
| Finnish | kolmetoistatuhattayhdeksänsataayhdeksänkymmentäyksi |
| French | treize mille neuf cent quatre-vingt-onze |
| Greek | δεκατρεις χίλιάδες εννιακόσια εννενήντα ένα |
| German | dreizehntausendneunhunderteinundneunzig |
| Hebrew | שלושה עשר אלף תשע מאות תשעים ואחת |
| Hindi | तेरह हज़ार नौ सौ इक्यानबे |
| Hungarian | tizenháromezerkilencszázkilencvenegy |
| Icelandic | þrettán þúsund og níuhundrað og níutíu og einn |
| Indonesian | tiga belas ribu sembilan ratus sembilan puluh satu |
| Italian | tredicimilanovecentonovantuno |
| Japanese | 一万三千九百九十一 |
| Korean | 만 삼천구백구십일 |
| Latvian | trīspadsmit tūkstoši deviņsimt deviņdesmit viens |
| Lithuanian | trylika tūkstančių devyni šimtai devyniasdešimt vienas |
| Norwegian | tretten tusen ni hundre og nittién |
| Persian | سیزده هزار و نهصد و نود و یک |
| Polish | trzynaście tysięcy dziewięćset dziewięćdziesiąt jeden |
| Portuguese | treze mil novecentos e noventa e um |
| Romanian | treisprezece mii nouă sute nouăzeci şi unu |
| Russian | тринадцать тысяч девятьсот девяносто один |
| Serbian | тринаест хиљада деветсто деведесет и један |
| Slovak | trinásť tisíc deväťsto deväťdesiatjeden |
| Slovene | trinajst tisuću devetsto devetdeset ena |
| Spanish | trece mil novecientos noventa y uno |
| Swahili | elfu kumi na tatu, mia tisa na tisini na moja |
| Swedish | trettontusenniohundranittioen |
| Thai | หนึ่งหมื่นสามพันเก้าร้อยเก้าสิบเอ็ด |
| Turkish | on üç bin dokuz yüz doksan bir |
| Ukrainian | тринадцять тисяч девʼятсот девʼяносто один |
| Vietnamese | mười ba nghìn chín trăm chín mươi mốt |
| Number 13991 reversed | 19931 | |
| Unicode Character | U+36A7 | 㚧 |
| Unix Timestamp | Thu, 01 Jan 1970 03:53:11 +0000 | |