The number 81337
81337 is a composite number with 4 divisors. Its prime factorisation is 163 × 499. Divisors (4): 1, 163, 499, 81337.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 81337: a semiprime: 163 × 499, the product of two primes.
- 2
81337 is composite. Its prime factorisation is
- 3
The divisors add up to 82000; without 81337 itself that is 663, so 81337 is deficient (663 is less than 81337). Euler's totient φ(81337) = 80676 numbers up to 81337 share no factor with it.
- 4
The digits of 81337 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 89 steps to reach 1.
LaTeX source of the formulas on this page
\[ 81337 = 163 \times 499 \]
81337 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 82000 |
| Euler totient φ(n) | 80676 |
| Square | 6615707569 |
| Cube | 538101806539753 |
| Square root | 285.196424 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 89 |
| Scientific notation | 8.1337 × |
81337 in other forms
| Form | Value |
|---|---|
| In words | eighty-one thousand three hundred and thirty-seven |
| Binary (base 2) | 10011110110111001 |
| Octal (base 8) | 236671 |
| Hexadecimal (base 16) | 13DB9 |
| Base 3 | 11010120111 |
| As time | 81337 seconds = 22 h 35 min 37 s |
Is 81337 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 2) | 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 1) | 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 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | 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 81337 a prime number?
No. 81337 = 163 × 499, so it is divisible by 163.
What are the factors of 81337?
1, 163, 499, 81337.
What is 81337 in binary?
10011110110111001 (hexadecimal 13DB9, octal 236671).
What is the square root of 81337?
About 285.1964.
Is 81337 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 81337?
81337 is a semiprime: 163 × 499, the product of two primes.