Names of 401991
| Nominal | 401991 |
| Cardinal | four hundred one thousand nine hundred ninety-one |
| Ordinal | 401,991st |
| This number as US currency | four hundred one thousand nine hundred ninety-one dollars |
| Is 401991 an odd number? | 401991 is an odd number |
| Is 401991 an even number? | 401991 is NOT an even number |
| Is 401991 a palindrome? | 401991 is NOT a palindrome number |
| Is 401991 a triangle number? | 401991 is NOT a triangle number |
401991 in other Bases
| Base 2 (Binary) | 11000100010010001112 |
| Base 3 (Ternary) | 2021021021203 |
| Base 4 (Quaternary) | 12020210134 |
| Base 5 (Quinary) | 1003304315 |
| Base 6 (Senary) | 123410236 |
| Base 8 (Octal) | 14211078 |
| Base 12 (Duodecimal) | 17477312 |
| Base 16 (Hexadecimal) | 6224716 |
| Base 20 (Vigesimal) | 2A4JB20 |
Primes and Factors tests for 401991
| Is 401991 a Prime Number? | 401991 is NOT a prime |
| Is 401991 a perfect number? | 401991 is NOT a perfect number |
| Is 401991 a Mersenne Prime? | 401991 is NOT a Mersenne prime |
| Is 401991 a Fermat Prime? | 401991 is NOT a Fermat prime |
| Is 401991 a Fibonacci Prime? | 401991 is NOT a Fibonacci prime |
| Is 401991 a Partition Prime? | 401991 is NOT a Partition prime |
| Is 401991 a Pell Prime? | 401991 is NOT a Pell prime |
| Prime Factors | Prime factors of 401991 |
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401991 in other Numerals
| 401991 in Roman Numeral | CDMCMXCI |
| 401991 in Chinese Numeral | 肆拾萬壹仟玖佰玖拾壹 |
| 401991 in Egyptian Numeral | 𓆐𓆐𓆐𓆐𓆼𓍪𓎎𓏺 |
| 401991 in Babylonian Numeral |    |
Roots and stuff for 401991
| Is 401991 a square number? | 401991 is NOT a square number |
| Is 401991 a cube number? | 401991 is NOT a cube number |
| Square root of the number 401991 | 634.02760192282 |
| Cube root of the number 401991 | 73.802676146521 |
Recreational math for 401991
| Number 401991 reversed | 199104 |
| Sum of the digits | 24 |
| No of digits | 6 |