The number 55509
55509 is a composite number with 4 divisors. Its prime factorisation is 3 × 18503. Divisors (4): 1, 3, 18503, 55509.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55509: a semiprime: 3 × 18503, the product of two primes.
- 2
55509 is composite. Its prime factorisation is
- 3
The divisors add up to 74016; without 55509 itself that is 18507, so 55509 is deficient (18507 is less than 55509). Euler's totient φ(55509) = 37004 numbers up to 55509 share no factor with it.
- 4
The digits of 55509 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 34 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55509 = 3 \times 18503 \]
55509 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 74016 |
| Euler totient φ(n) | 37004 |
| Square | 3081249081 |
| Cube | 171037055237229 |
| Square root | 235.603480 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 34 |
| Scientific notation | 5.5509 × |
55509 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand five hundred and nine |
| Binary (base 2) | 1101100011010101 |
| Octal (base 8) | 154325 |
| Hexadecimal (base 16) | D8D5 |
| Base 3 | 2211010220 |
| As time | 55509 seconds = 15 h 25 min 9 s |
Is 55509 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 | Yes (55509 ÷ 3 = 18503) | 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 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 55509 a prime number?
No. 55509 = 3 × 18503, so it is divisible by 3.
What are the factors of 55509?
1, 3, 18503, 55509.
What is 55509 in binary?
1101100011010101 (hexadecimal D8D5, octal 154325).
What is the square root of 55509?
About 235.6035.
Is 55509 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 55509?
55509 is a semiprime: 3 × 18503, the product of two primes.