The number 27161
27161 is a composite number with 4 divisors. Its prime factorisation is 157 × 173. Divisors (4): 1, 157, 173, 27161.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27161: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 157 × 173, the product of two primes.
- 2
27161 is composite. Its prime factorisation is
- 3
The divisors add up to 27492; without 27161 itself that is 331, so 27161 is deficient (331 is less than 27161). Euler's totient φ(27161) = 26832 numbers up to 27161 share no factor with it.
- 4
The digits of 27161 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 38 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27161 = 157 \times 173 \]
27161 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 27492 |
| Euler totient φ(n) | 26832 |
| Square | 737719921 |
| Cube | 20037210774281 |
| Square root | 164.805946 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 38 |
| Scientific notation | 2.7161 × |
27161 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand one hundred and sixty-one |
| Binary (base 2) | 110101000011001 |
| Octal (base 8) | 65031 |
| Hexadecimal (base 16) | 6A19 |
| Base 3 | 1101020222 |
| As time | 27161 seconds = 7 h 32 min 41 s |
Is 27161 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 1) | 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 1) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 27161 a prime number?
No. 27161 = 157 × 173, so it is divisible by 157.
What are the factors of 27161?
1, 157, 173, 27161.
What is 27161 in binary?
110101000011001 (hexadecimal 6A19, octal 65031).
What is the square root of 27161?
About 164.8059.
Is 27161 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 27161?
27161 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 157 × 173, the product of two primes.