The number 16551
16551 is a composite number with 8 divisors. Its prime factorisation is × 613. Divisors (8): 1, 3, 9, 27, 613, 1839, 5517, 16551.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
16551 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
16551 is composite. Its prime factorisation is
- 3
The divisors add up to 24560; without 16551 itself that is 8009, so 16551 is deficient (8009 is less than 16551). Euler's totient φ(16551) = 11016 numbers up to 16551 share no factor with it.
- 4
The digits of 16551 add up to 18, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 120 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16551 = 3^{3} \times 613 \]16551 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 24560 |
| Euler totient φ(n) | 11016 |
| Square | 273935601 |
| Cube | 4533908132151 |
| Square root | 128.650690 (= 3√1839) |
| Digit sum / digital root | 18 / 9 |
| Collatz steps to 1 | 120 |
| Scientific notation | 1.6551 × |
16551 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand five hundred and fifty-one |
| Binary (base 2) | 100000010100111 |
| Octal (base 8) | 40247 |
| Hexadecimal (base 16) | 40A7 |
| Base 3 | 211201000 |
| As time | 16551 seconds = 4 h 35 min 51 s |
Is 16551 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 (16551 ÷ 3 = 5517) | 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 | No (remainder 1) | 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 3) | 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 | Yes (16551 ÷ 9 = 1839) | 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 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 16551 a prime number?
No. 16551 = × 613, so it is divisible by 3.
What are the factors of 16551?
1, 3, 9, 27, 613, 1839, 5517, 16551.
What is 16551 in binary?
100000010100111 (hexadecimal 40A7, octal 40247).
What is the square root of 16551?
About 128.6507, exactly 3√1839.
Is 16551 divisible by 3?
Yes. Its digits add up to 18, a multiple of 3.
What is special about the number 16551?
It is a composite number with 8 divisors.