| Nominal | 18561 |
| Cardinal | eighteen thousand five hundred sixty-one |
Cardinal eighteen thousand five hundred sixty-one | |
| Ordinal | 18,561st |
| Number of digits | 5 |
| Sum of digits | 21 |
| Product of digits | 240 |
| Number parity | Odd |
| Prime factorization | 3 x 23 x 269 |
| Prime factors | 3, 23, 269 |
| Number of distinct prime factors ω(n) | 3 |
| Total number of prime factors Ω(n) | 3 |
| Sum of prime factors | 295 |
| Product of prime factors | 18561 |
| Is 18561 a prime number? | No |
| Is 18561 a semiprime number? | No |
| Is 18561 a Chen prime number? | No |
| Is 18561 a Mersenne prime number? | No |
| Is 18561 a Catalan number? | No |
| Is 18561 a Fibonacci number? | No |
| Is 18561 a Idoneal number? | No |
| Square of 18561 (n2) | 344510721 |
| Cube of 18561 (n3) | 6394463492481 |
| Square root of 18561 | 136.23876100435 |
| Natural Logarithm (ln) of 18561 | 9.8288178841991 |
| Decimal Logarithm (log) of 18561 | 4.2686013707397 |
| Sine of 18561 | 0.45342345459483 |
| Cosecant of 18561 | 2.2054439175265 |
| Cosine of 18561 | 0.89129522091353 |
| Secant of 18561 | 1.121962708355 |
| Tangent of 18561 | 0.50872420714889 |
| Cotangent of 18561 | 1.9657016236841 |
| The spelling of 18561 in words is "eighteen thousand five hundred sixty-one", meaning that: |
| 18561 is not an aban number (as it contains the letter a) |
| 18561 is not an eban number (as it contains the letter e) |
| 18561 is not an iban number (as it contains the letter i) |
| 18561 is not an oban number (as it contains the letter o) |
| 18561 is not a tban number (as it contains the letter t) |
| 18561 is not an uban number (as it contains the letter u) |
| Bengali numerals | ১৮৫৬১ |
| Eastern Arabic numerals | ١٨٬٥٦١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍦𓎋𓏺 |
| Khmer numerals | ១៨៥៦១ |
| Japanese numerals | 一万八千五百六十一 |
| Roman numerals | n/a |
| Thai numerals | ๑๘๕๖๑ |
| Arabic | ثمانية عشر ألف و خمسة مائة و واحد و ستون |
| Croatian | osamnaest tisuća petsto šezdeset i jedan |
| Czech | osmnáct tisíc pět set šedesát jeden |
| Danish | atten tusinde fem hundrede en og tres |
| Dutch | achttienduizend vijfhonderdéénenzestig |
| Estonian | akpe wuienyi alafa atɔ̃ blaade vɔ ɖekɛ |
| Faroese | átjan tusin og fimmhundraðogsekstiein |
| Filipino | labíng-walóng libó’t limáng daán at anim na pû’t isá |
| Finnish | kahdeksantoistatuhattaviisisataakuusikymmentäyksi |
| French | dix-huit mille cinq cent soixante et un |
| Greek | δεκαοκτώ χίλιάδες πεντακόσια εξήντα ένα |
| German | achtzehntausendfünfhunderteinundsechzig |
| Hebrew | שמונה עשר אלף חמש מאות שישים ואחת |
| Hindi | अठारह हज़ार पाँच सौ इकसठ |
| Hungarian | tizennyolcezerötszázhatvanegy |
| Icelandic | átján þúsund og fimmhundrað og sextíu og einn |
| Indonesian | delapan belas ribu lima ratus enam puluh satu |
| Italian | diciottomilacinquecentosessantuno |
| Japanese | 一万八千五百六十一 |
| Korean | 만 팔천오백육십일 |
| Latvian | astoņpadsmit tūkstoši piecsimt sešdesmit viens |
| Lithuanian | aštuoniolika tūkstančių penki šimtai šešiasdešimt vienas |
| Norwegian | atten tusen fem hundre og sekstién |
| Persian | هجده هزار و پانصد و شصت و یک |
| Polish | osiemnaście tysięcy pięćset sześćdziesiąt jeden |
| Portuguese | dezoito mil quinhentos e sessenta e um |
| Romanian | optsprezece mii cinci sute şasezeci şi unu |
| Russian | восемнадцать тысяч пятьсот шестьдесят один |
| Serbian | осамнаест хиљада петсто шездесет и један |
| Slovak | osemnásť tisíc päťsto šesťdesiatjeden |
| Slovene | asemnajst tisuću petsto šestdeset ena |
| Spanish | dieciocho mil quinientos sesenta y uno |
| Swahili | elfu kumi na nane, mia tano na sitini na moja |
| Swedish | artontusenfemhundrasextioen |
| Thai | หนึ่งหมื่นแปดพันห้าร้อยหกสิบเอ็ด |
| Turkish | on sekiz bin beş yüz altmış bir |
| Ukrainian | вісімнадцять тисяч пʼятсот шістдесят один |
| Vietnamese | mười tám nghìn năm trăm sáu mươi mốt |
| Number 18561 reversed | 16581 | |
| Unicode Character | U+4881 | 䢁 |
| Unix Timestamp | Thu, 01 Jan 1970 05:09:21 +0000 | |