Names of 1561
| Nominal | 1561 |
| Cardinal | one thousand five hundred sixty-one |
| Ordinal | 1,561st |
| This number as US currency | one thousand five hundred sixty-one dollars |
| Is 1561 an odd number? | 1561 is an odd number |
| Is 1561 an even number? | 1561 is NOT an even number |
| Is 1561 a palindrome? | 1561 is NOT a palindrome number |
| Is 1561 a triangle number? | 1561 is NOT a triangle number |
1561 in other Bases
| Base 2 (Binary) | 110000110012 |
| Base 3 (Ternary) | 20102113 |
| Base 4 (Quaternary) | 1201214 |
| Base 5 (Quinary) | 222215 |
| Base 6 (Senary) | 111216 |
| Base 8 (Octal) | 30318 |
| Base 12 (Duodecimal) | AA112 |
| Base 16 (Hexadecimal) | 61916 |
| Base 20 (Vigesimal) | 3I120 |
Primes and Factors tests for 1561
| Is 1561 a Prime Number? | 1561 is NOT a prime |
| Is 1561 a perfect number? | 1561 is NOT a perfect number |
| Is 1561 a Mersenne Prime? | 1561 is NOT a Mersenne prime |
| Is 1561 a Fermat Prime? | 1561 is NOT a Fermat prime |
| Is 1561 a Fibonacci Prime? | 1561 is NOT a Fibonacci prime |
| Is 1561 a Partition Prime? | 1561 is NOT a Partition prime |
| Is 1561 a Pell Prime? | 1561 is NOT a Pell prime |
| Prime Factors | Prime factors of 1561 |
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1561 in other Numerals
| 1561 in Roman Numeral | MDLXI |
| 1561 in Chinese Numeral | 壹仟伍佰陸拾壹 |
| 1561 in Egyptian Numeral | 𓆼𓍦𓎋𓏺 |
| 1561 in Babylonian Numeral |   |
Roots and stuff for 1561
| Is 1561 a square number? | 1561 is NOT a square number |
| Is 1561 a cube number? | 1561 is NOT a cube number |
| Square root of the number 1561 | 39.509492530277 |
| Cube root of the number 1561 | 11.600257624084 |
Recreational math for 1561
| Number 1561 reversed | 1651 |
| Sum of the digits | 13 |
| No of digits | 4 |