The number 81037
81037 is a composite number with 8 divisors. Its prime factorisation is 11 × 53 × 139. Divisors (8): 1, 11, 53, 139, 583, 1529, 7367, 81037.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
81037 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
81037 is composite. Its prime factorisation is
- 3
The divisors add up to 90720; without 81037 itself that is 9683, so 81037 is deficient (9683 is less than 81037). Euler's totient φ(81037) = 71760 numbers up to 81037 share no factor with it.
- 4
The digits of 81037 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 76 steps to reach 1.
LaTeX source of the formulas on this page
\[ 81037 = 11 \times 53 \times 139 \]
81037 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 90720 |
| Euler totient φ(n) | 71760 |
| Square | 6566995369 |
| Cube | 532169603717653 |
| Square root | 284.669984 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 76 |
| Scientific notation | 8.1037 × |
81037 in other forms
| Form | Value |
|---|---|
| In words | eighty-one thousand and thirty-seven |
| Binary (base 2) | 10011110010001101 |
| Octal (base 8) | 236215 |
| Hexadecimal (base 16) | 13C8D |
| Base 3 | 11010011101 |
| As time | 81037 seconds = 22 h 30 min 37 s |
Is 81037 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 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | 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 | Yes (81037 ÷ 11 = 7367) | 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 81037 a prime number?
No. 81037 = 11 × 53 × 139, so it is divisible by 11.
What are the factors of 81037?
1, 11, 53, 139, 583, 1529, 7367, 81037.
What is 81037 in binary?
10011110010001101 (hexadecimal 13C8D, octal 236215).
What is the square root of 81037?
About 284.6700.
Is 81037 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 81037?
It is a composite number with 8 divisors.