The number 71241
71241 is a composite number with 4 divisors. Its prime factorisation is 3 × 23747. Divisors (4): 1, 3, 23747, 71241.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 71241: a semiprime: 3 × 23747, the product of two primes.
- 2
71241 is composite. Its prime factorisation is
- 3
The divisors add up to 94992; without 71241 itself that is 23751, so 71241 is deficient (23751 is less than 71241). Euler's totient φ(71241) = 47492 numbers up to 71241 share no factor with it.
- 4
The digits of 71241 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 125 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71241 = 3 \times 23747 \]
71241 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 94992 |
| Euler totient φ(n) | 47492 |
| Square | 5075280081 |
| Cube | 361568028250521 |
| Square root | 266.910097 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 125 |
| Scientific notation | 7.1241 × |
71241 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand two hundred and forty-one |
| Binary (base 2) | 10001011001001001 |
| Octal (base 8) | 213111 |
| Hexadecimal (base 16) | 11649 |
| Base 3 | 10121201120 |
| As time | 71241 seconds = 19 h 47 min 21 s |
Is 71241 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 | Yes (71241 ÷ 3 = 23747) | 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 3) | 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 6) | 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 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 71241 a prime number?
No. 71241 = 3 × 23747, so it is divisible by 3.
What are the factors of 71241?
1, 3, 23747, 71241.
What is 71241 in binary?
10001011001001001 (hexadecimal 11649, octal 213111).
What is the square root of 71241?
About 266.9101.
Is 71241 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 71241?
71241 is a semiprime: 3 × 23747, the product of two primes.