The number 27491
27491 is a composite number with 4 divisors. Its prime factorisation is 37 × 743. Divisors (4): 1, 37, 743, 27491.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27491: a semiprime: 37 × 743, the product of two primes.
- 2
27491 is composite. Its prime factorisation is
- 3
The divisors add up to 28272; without 27491 itself that is 781, so 27491 is deficient (781 is less than 27491). Euler's totient φ(27491) = 26712 numbers up to 27491 share no factor with it.
- 4
The digits of 27491 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 33 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27491 = 37 \times 743 \]
27491 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 28272 |
| Euler totient φ(n) | 26712 |
| Square | 755755081 |
| Cube | 20776462931771 |
| Square root | 165.804101 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 33 |
| Scientific notation | 2.7491 × |
27491 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand four hundred and ninety-one |
| Binary (base 2) | 110101101100011 |
| Octal (base 8) | 65543 |
| Hexadecimal (base 16) | 6B63 |
| Base 3 | 1101201012 |
| As time | 27491 seconds = 7 h 38 min 11 s |
Is 27491 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 27491 a prime number?
No. 27491 = 37 × 743, so it is divisible by 37.
What are the factors of 27491?
1, 37, 743, 27491.
What is 27491 in binary?
110101101100011 (hexadecimal 6B63, octal 65543).
What is the square root of 27491?
About 165.8041.
Is 27491 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 27491?
27491 is a semiprime: 37 × 743, the product of two primes.