The number 72241
72241 is a composite number with 4 divisors. Its prime factorisation is 13 × 5557. Divisors (4): 1, 13, 5557, 72241.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 72241: a semiprime: 13 × 5557, the product of two primes.
- 2
72241 is composite. Its prime factorisation is
- 3
The divisors add up to 77812; without 72241 itself that is 5571, so 72241 is deficient (5571 is less than 72241). Euler's totient φ(72241) = 66672 numbers up to 72241 share no factor with it.
- 4
The digits of 72241 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 187 steps to reach 1.
LaTeX source of the formulas on this page
\[ 72241 = 13 \times 5557 \]
72241 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 77812 |
| Euler totient φ(n) | 66672 |
| Square | 5218762081 |
| Cube | 377008591493521 |
| Square root | 268.776859 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 187 |
| Scientific notation | 7.2241 × |
72241 in other forms
| Form | Value |
|---|---|
| In words | seventy-two thousand two hundred and forty-one |
| Binary (base 2) | 10001101000110001 |
| Octal (base 8) | 215061 |
| Hexadecimal (base 16) | 11A31 |
| Base 3 | 10200002121 |
| As time | 72241 seconds = 20 h 4 min 1 s |
Is 72241 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 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 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 4) | 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 72241 a prime number?
No. 72241 = 13 × 5557, so it is divisible by 13.
What are the factors of 72241?
1, 13, 5557, 72241.
What is 72241 in binary?
10001101000110001 (hexadecimal 11A31, octal 215061).
What is the square root of 72241?
About 268.7769.
Is 72241 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 72241?
72241 is a semiprime: 13 × 5557, the product of two primes.