Names of 1645
| Nominal | 1645 |
| Cardinal | one thousand six hundred forty-five |
| Ordinal | 1,645th |
| This number as US currency | one thousand six hundred forty-five dollars |
| Is 1645 an odd number? | 1645 is an odd number |
| Is 1645 an even number? | 1645 is NOT an even number |
| Is 1645 a palindrome? | 1645 is NOT a palindrome number |
| Is 1645 a triangle number? | 1645 is NOT a triangle number |
1645 in other Bases
| Base 2 (Binary) | 110011011012 |
| Base 3 (Ternary) | 20202213 |
| Base 4 (Quaternary) | 1212314 |
| Base 5 (Quinary) | 230405 |
| Base 6 (Senary) | 113416 |
| Base 8 (Octal) | 31558 |
| Base 12 (Duodecimal) | B5112 |
| Base 16 (Hexadecimal) | 66D16 |
| Base 20 (Vigesimal) | 42520 |
Primes and Factors tests for 1645
| Is 1645 a Prime Number? | 1645 is NOT a prime |
| Is 1645 a perfect number? | 1645 is NOT a perfect number |
| Is 1645 a Mersenne Prime? | 1645 is NOT a Mersenne prime |
| Is 1645 a Fermat Prime? | 1645 is NOT a Fermat prime |
| Is 1645 a Fibonacci Prime? | 1645 is NOT a Fibonacci prime |
| Is 1645 a Partition Prime? | 1645 is NOT a Partition prime |
| Is 1645 a Pell Prime? | 1645 is NOT a Pell prime |
| Prime Factors | Prime factors of 1645 |
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1645 in other Numerals
| 1645 in Roman Numeral | MDCXLV |
| 1645 in Chinese Numeral | 壹仟陸佰肆拾伍 |
| 1645 in Egyptian Numeral | 𓆼𓍧𓎉𓏾 |
| 1645 in Babylonian Numeral |   |
Roots and stuff for 1645
| Is 1645 a square number? | 1645 is NOT a square number |
| Is 1645 a cube number? | 1645 is NOT a cube number |
| Square root of the number 1645 | 40.558599581346 |
| Cube root of the number 1645 | 11.804709410072 |
Recreational math for 1645
| Number 1645 reversed | 5461 |
| Sum of the digits | 16 |
| No of digits | 4 |