The number 38491
38491 is a composite number with 4 divisors. Its prime factorisation is 61 × 631. Divisors (4): 1, 61, 631, 38491.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 38491: a semiprime: 61 × 631, the product of two primes.
- 2
38491 is composite. Its prime factorisation is
- 3
The divisors add up to 39184; without 38491 itself that is 693, so 38491 is deficient (693 is less than 38491). Euler's totient φ(38491) = 37800 numbers up to 38491 share no factor with it.
- 4
The digits of 38491 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 93 steps to reach 1.
LaTeX source of the formulas on this page
\[ 38491 = 61 \times 631 \]
38491 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 39184 |
| Euler totient φ(n) | 37800 |
| Square | 1481557081 |
| Cube | 57026613604771 |
| Square root | 196.191233 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 93 |
| Scientific notation | 3.8491 × |
38491 in other forms
| Form | Value |
|---|---|
| In words | thirty-eight thousand four hundred and ninety-one |
| Binary (base 2) | 1001011001011011 |
| Octal (base 8) | 113133 |
| Hexadecimal (base 16) | 965B |
| Base 3 | 1221210121 |
| As time | 38491 seconds = 10 h 41 min 31 s |
Is 38491 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 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 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 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 38491 a prime number?
No. 38491 = 61 × 631, so it is divisible by 61.
What are the factors of 38491?
1, 61, 631, 38491.
What is 38491 in binary?
1001011001011011 (hexadecimal 965B, octal 113133).
What is the square root of 38491?
About 196.1912.
Is 38491 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 38491?
38491 is a semiprime: 61 × 631, the product of two primes.