The number 24991
24991 is a composite number with 4 divisors. Its prime factorisation is 67 × 373. Divisors (4): 1, 67, 373, 24991.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 24991: a semiprime: 67 × 373, the product of two primes.
- 2
24991 is composite. Its prime factorisation is
- 3
The divisors add up to 25432; without 24991 itself that is 441, so 24991 is deficient (441 is less than 24991). Euler's totient φ(24991) = 24552 numbers up to 24991 share no factor with it.
- 4
The digits of 24991 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 87 steps to reach 1.
LaTeX source of the formulas on this page
\[ 24991 = 67 \times 373 \]
24991 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 25432 |
| Euler totient φ(n) | 24552 |
| Square | 624550081 |
| Cube | 15608131074271 |
| Square root | 158.085420 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 87 |
| Scientific notation | 2.4991 × |
24991 in other forms
| Form | Value |
|---|---|
| In words | twenty-four thousand nine hundred and ninety-one |
| Binary (base 2) | 110000110011111 |
| Octal (base 8) | 60637 |
| Hexadecimal (base 16) | 619F |
| Base 3 | 1021021121 |
| As time | 24991 seconds = 6 h 56 min 31 s |
Is 24991 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 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 1) | 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 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 24991 a prime number?
No. 24991 = 67 × 373, so it is divisible by 67.
What are the factors of 24991?
1, 67, 373, 24991.
What is 24991 in binary?
110000110011111 (hexadecimal 619F, octal 60637).
What is the square root of 24991?
About 158.0854.
Is 24991 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 24991?
24991 is a semiprime: 67 × 373, the product of two primes.