Names of 1861
| Nominal | 1861 |
| Cardinal | one thousand eight hundred sixty-one |
| Ordinal | 1,861st |
| This number as US currency | one thousand eight hundred sixty-one dollars |
| Is 1861 an odd number? | 1861 is an odd number |
| Is 1861 an even number? | 1861 is NOT an even number |
| Is 1861 a palindrome? | 1861 is NOT a palindrome number |
| Is 1861 a triangle number? | 1861 is NOT a triangle number |
1861 in other Bases
| Base 2 (Binary) | 111010001012 |
| Base 3 (Ternary) | 21122213 |
| Base 4 (Quaternary) | 1310114 |
| Base 5 (Quinary) | 244215 |
| Base 6 (Senary) | 123416 |
| Base 8 (Octal) | 35058 |
| Base 12 (Duodecimal) | 10B112 |
| Base 16 (Hexadecimal) | 74516 |
| Base 20 (Vigesimal) | 4D120 |
Primes and Factors tests for 1861
| Is 1861 a Prime Number? | 1861 is a prime |
| Is 1861 a perfect number? | 1861 is NOT a perfect number |
| Is 1861 a Mersenne Prime? | 1861 is NOT a Mersenne prime |
| Is 1861 a Fermat Prime? | 1861 is NOT a Fermat prime |
| Is 1861 a Fibonacci Prime? | 1861 is NOT a Fibonacci prime |
| Is 1861 a Partition Prime? | 1861 is NOT a Partition prime |
| Is 1861 a Pell Prime? | 1861 is NOT a Pell prime |
| Prime Factors | Prime factors of 1861 |
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1861 in other Numerals
| 1861 in Roman Numeral | MDCCCLXI |
| 1861 in Chinese Numeral | 壹仟捌佰陸拾壹 |
| 1861 in Egyptian Numeral | 𓆼𓍩𓎋𓏺 |
| 1861 in Babylonian Numeral |   |
Roots and stuff for 1861
| Is 1861 a square number? | 1861 is NOT a square number |
| Is 1861 a cube number? | 1861 is NOT a cube number |
| Square root of the number 1861 | 43.139309220246 |
| Cube root of the number 1861 | 12.30029302847 |
Recreational math for 1861
| Number 1861 reversed | 1681 |
| Sum of the digits | 16 |
| No of digits | 4 |