The number 16671
16671 is a composite number with 4 divisors. Its prime factorisation is 3 × 5557. Divisors (4): 1, 3, 5557, 16671.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 16671: a semiprime: 3 × 5557, the product of two primes.
- 2
16671 is composite. Its prime factorisation is
- 3
The divisors add up to 22232; without 16671 itself that is 5561, so 16671 is deficient (5561 is less than 16671). Euler's totient φ(16671) = 11112 numbers up to 16671 share no factor with it.
- 4
The digits of 16671 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 159 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16671 = 3 \times 5557 \]
16671 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 22232 |
| Euler totient φ(n) | 11112 |
| Square | 277922241 |
| Cube | 4633241679711 |
| Square root | 129.116227 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 159 |
| Scientific notation | 1.6671 × |
16671 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand six hundred and seventy-one |
| Binary (base 2) | 100000100011111 |
| Octal (base 8) | 40437 |
| Hexadecimal (base 16) | 411F |
| Base 3 | 211212110 |
| As time | 16671 seconds = 4 h 37 min 51 s |
Is 16671 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 (16671 ÷ 3 = 5557) | 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 4) | 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 3) | 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 6) | 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 16671 a prime number?
No. 16671 = 3 × 5557, so it is divisible by 3.
What are the factors of 16671?
1, 3, 5557, 16671.
What is 16671 in binary?
100000100011111 (hexadecimal 411F, octal 40437).
What is the square root of 16671?
About 129.1162.
Is 16671 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 16671?
16671 is a semiprime: 3 × 5557, the product of two primes.