The number 27155
27155 is a composite number with 4 divisors. Its prime factorisation is 5 × 5431. Divisors (4): 1, 5, 5431, 27155.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27155: a semiprime: 5 × 5431, the product of two primes.
- 2
27155 is composite. Its prime factorisation is
- 3
The divisors add up to 32592; without 27155 itself that is 5437, so 27155 is deficient (5437 is less than 27155). Euler's totient φ(27155) = 21720 numbers up to 27155 share no factor with it.
- 4
The digits of 27155 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 90 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27155 = 5 \times 5431 \]
27155 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 32592 |
| Euler totient φ(n) | 21720 |
| Square | 737394025 |
| Cube | 20023934748875 |
| Square root | 164.787742 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 90 |
| Scientific notation | 2.7155 × |
27155 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand one hundred and fifty-five |
| Binary (base 2) | 110101000010011 |
| Octal (base 8) | 65023 |
| Hexadecimal (base 16) | 6A13 |
| Base 3 | 1101020202 |
| As time | 27155 seconds = 7 h 32 min 35 s |
Is 27155 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 | Yes (27155 ÷ 5 = 5431) | 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 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | 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 27155 a prime number?
No. 27155 = 5 × 5431, so it is divisible by 5.
What are the factors of 27155?
1, 5, 5431, 27155.
What is 27155 in binary?
110101000010011 (hexadecimal 6A13, octal 65023).
What is the square root of 27155?
About 164.7877.
Is 27155 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 27155?
27155 is a semiprime: 5 × 5431, the product of two primes.