The number 55081
55081 is a composite number with 8 divisors. Its prime factorisation is 13 × 19 × 223. Divisors (8): 1, 13, 19, 223, 247, 2899, 4237, 55081.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55081: a Harshad number: divisible by its digit sum 19.
- 2
55081 is composite. Its prime factorisation is
- 3
The divisors add up to 62720; without 55081 itself that is 7639, so 55081 is deficient (7639 is less than 55081). Euler's totient φ(55081) = 47952 numbers up to 55081 share no factor with it.
- 4
The digits of 55081 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 153 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55081 = 13 \times 19 \times 223 \]
55081 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 62720 |
| Euler totient φ(n) | 47952 |
| Square | 3033916561 |
| Cube | 167111158096441 |
| Square root | 234.693417 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 153 |
| Scientific notation | 5.5081 × |
55081 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand and eighty-one |
| Binary (base 2) | 1101011100101001 |
| Octal (base 8) | 153451 |
| Hexadecimal (base 16) | D729 |
| Base 3 | 2210120001 |
| As time | 55081 seconds = 15 h 18 min 1 s |
Is 55081 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 1) | 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 1) | 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 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55081 a prime number?
No. 55081 = 13 × 19 × 223, so it is divisible by 13.
What are the factors of 55081?
1, 13, 19, 223, 247, 2899, 4237, 55081.
What is 55081 in binary?
1101011100101001 (hexadecimal D729, octal 153451).
What is the square root of 55081?
About 234.6934.
Is 55081 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 55081?
55081 is a Harshad number: divisible by its digit sum 19.