The number 16081
16081 is a composite number with 4 divisors. Its prime factorisation is 13 × 1237. Divisors (4): 1, 13, 1237, 16081.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 16081: a semiprime: 13 × 1237, the product of two primes.
- 2
16081 is composite. Its prime factorisation is
- 3
The divisors add up to 17332; without 16081 itself that is 1251, so 16081 is deficient (1251 is less than 16081). Euler's totient φ(16081) = 14832 numbers up to 16081 share no factor with it.
- 4
The digits of 16081 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 97 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16081 = 13 \times 1237 \]
16081 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 17332 |
| Euler totient φ(n) | 14832 |
| Square | 258598561 |
| Cube | 4158523459441 |
| Square root | 126.810883 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 97 |
| Scientific notation | 1.6081 × |
16081 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand and eighty-one |
| Binary (base 2) | 11111011010001 |
| Octal (base 8) | 37321 |
| Hexadecimal (base 16) | 3ED1 |
| Base 3 | 211001121 |
| As time | 16081 seconds = 4 h 28 min 1 s |
Is 16081 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 1) | 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 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 1) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 16081 a prime number?
No. 16081 = 13 × 1237, so it is divisible by 13.
What are the factors of 16081?
1, 13, 1237, 16081.
What is 16081 in binary?
11111011010001 (hexadecimal 3ED1, octal 37321).
What is the square root of 16081?
About 126.8109.
Is 16081 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 16081?
16081 is a semiprime: 13 × 1237, the product of two primes.