Names of 861
| Nominal | 861 |
| Cardinal | eight hundred sixty-one |
| Ordinal | 861st |
| This number as US currency | eight hundred sixty-one dollars |
| Is 861 an odd number? | 861 is an odd number |
| Is 861 an even number? | 861 is NOT an even number |
| Is 861 a palindrome? | 861 is NOT a palindrome number |
| Is 861 a triangle number? | 861 is a triangle number |
861 in other Bases
| Base 2 (Binary) | 11010111012 |
| Base 3 (Ternary) | 10112203 |
| Base 4 (Quaternary) | 311314 |
| Base 5 (Quinary) | 114215 |
| Base 6 (Senary) | 35536 |
| Base 8 (Octal) | 15358 |
| Base 12 (Duodecimal) | 5B912 |
| Base 16 (Hexadecimal) | 35D16 |
| Base 20 (Vigesimal) | 23120 |
Primes and Factors tests for 861
| Is 861 a Prime Number? | 861 is NOT a prime |
| Is 861 a perfect number? | 861 is NOT a perfect number |
| Is 861 a Mersenne Prime? | 861 is NOT a Mersenne prime |
| Is 861 a Fermat Prime? | 861 is NOT a Fermat prime |
| Is 861 a Fibonacci Prime? | 861 is NOT a Fibonacci prime |
| Is 861 a Partition Prime? | 861 is NOT a Partition prime |
| Is 861 a Pell Prime? | 861 is NOT a Pell prime |
| Prime Factors | Prime factors of 861 |
Sponsored
861 in other Numerals
| 861 in Roman Numeral | DCCCLXI |
| 861 in Chinese Numeral | 捌佰陸拾壹 |
| 861 in Egyptian Numeral | 𓍩𓎋𓏺 |
| 861 in Babylonian Numeral |   |
Roots and stuff for 861
| Is 861 a square number? | 861 is NOT a square number |
| Is 861 a cube number? | 861 is NOT a cube number |
| Square root of the number 861 | 29.342801502242 |
| Cube root of the number 861 | 9.5133699099061 |
Recreational math for 861
| Number 861 reversed | 168 |
| Sum of the digits | 15 |
| No of digits | 3 |