The number 18163
18163 is a composite number with 4 divisors. Its prime factorisation is 41 × 443. Divisors (4): 1, 41, 443, 18163.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18163: a semiprime: 41 × 443, the product of two primes.
- 2
18163 is composite. Its prime factorisation is
- 3
The divisors add up to 18648; without 18163 itself that is 485, so 18163 is deficient (485 is less than 18163). Euler's totient φ(18163) = 17680 numbers up to 18163 share no factor with it.
- 4
The digits of 18163 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 97 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18163 = 41 \times 443 \]
18163 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 18648 |
| Euler totient φ(n) | 17680 |
| Square | 329894569 |
| Cube | 5991875056747 |
| Square root | 134.770175 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 97 |
| Scientific notation | 1.8163 × |
18163 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand one hundred and sixty-three |
| Binary (base 2) | 100011011110011 |
| Octal (base 8) | 43363 |
| Hexadecimal (base 16) | 46F3 |
| Base 3 | 220220201 |
| As time | 18163 seconds = 5 h 2 min 43 s |
Is 18163 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 | No (remainder 3) | 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 3) | 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 3) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | 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 18163 a prime number?
No. 18163 = 41 × 443, so it is divisible by 41.
What are the factors of 18163?
1, 41, 443, 18163.
What is 18163 in binary?
100011011110011 (hexadecimal 46F3, octal 43363).
What is the square root of 18163?
About 134.7702.
Is 18163 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 18163?
18163 is a semiprime: 41 × 443, the product of two primes.