The number 4981
4981 is a composite number with 4 divisors. Its prime factorisation is 17 × 293. Divisors (4): 1, 17, 293, 4981.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 4981: a semiprime: 17 × 293, the product of two primes.
- 2
4981 is composite. Its prime factorisation is
- 3
The divisors add up to 5292; without 4981 itself that is 311, so 4981 is deficient (311 is less than 4981). Euler's totient φ(4981) = 4672 numbers up to 4981 share no factor with it.
- 4
The digits of 4981 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 90 steps to reach 1.
LaTeX source of the formulas on this page
\[ 4981 = 17 \times 293 \]
4981 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 5292 |
| Euler totient φ(n) | 4672 |
| Square | 24810361 |
| Cube | 123580408141 |
| Square root | 70.576200 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 90 |
| Scientific notation | 4.981 × |
4981 in other forms
| Form | Value |
|---|---|
| In words | four thousand nine hundred and eighty-one |
| Binary (base 2) | 1001101110101 |
| Octal (base 8) | 11565 |
| Hexadecimal (base 16) | 1375 |
| Base 3 | 20211111 |
| As time | 4981 seconds = 1 h 23 min 1 s |
Is 4981 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 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | 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 9) | 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 4981 a prime number?
No. 4981 = 17 × 293, so it is divisible by 17.
What are the factors of 4981?
1, 17, 293, 4981.
What is 4981 in binary?
1001101110101 (hexadecimal 1375, octal 11565).
What is the square root of 4981?
About 70.5762.
Is 4981 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 4981?
4981 is a semiprime: 17 × 293, the product of two primes.