The number 55015
55015 is a composite number with 4 divisors. Its prime factorisation is 5 × 11003. Divisors (4): 1, 5, 11003, 55015.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55015: a semiprime: 5 × 11003, the product of two primes.
- 2
55015 is composite. Its prime factorisation is
- 3
The divisors add up to 66024; without 55015 itself that is 11009, so 55015 is deficient (11009 is less than 55015). Euler's totient φ(55015) = 44008 numbers up to 55015 share no factor with it.
- 4
The digits of 55015 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 122 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55015 = 5 \times 11003 \]
55015 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 66024 |
| Euler totient φ(n) | 44008 |
| Square | 3026650225 |
| Cube | 166511162128375 |
| Square root | 234.552766 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 122 |
| Scientific notation | 5.5015 × |
55015 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand and fifteen |
| Binary (base 2) | 1101011011100111 |
| Octal (base 8) | 153347 |
| Hexadecimal (base 16) | D6E7 |
| Base 3 | 2210110121 |
| As time | 55015 seconds = 15 h 16 min 55 s |
Is 55015 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (55015 ÷ 5 = 11003) | 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 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | 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 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55015 a prime number?
No. 55015 = 5 × 11003, so it is divisible by 5.
What are the factors of 55015?
1, 5, 11003, 55015.
What is 55015 in binary?
1101011011100111 (hexadecimal D6E7, octal 153347).
What is the square root of 55015?
About 234.5528.
Is 55015 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 55015?
55015 is a semiprime: 5 × 11003, the product of two primes.