The number 81103
81103 is a composite number with 8 divisors. Its prime factorisation is 11 × 73 × 101. Divisors (8): 1, 11, 73, 101, 803, 1111, 7373, 81103.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
81103 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
81103 is composite. Its prime factorisation is
- 3
The divisors add up to 90576; without 81103 itself that is 9473, so 81103 is deficient (9473 is less than 81103). Euler's totient φ(81103) = 72000 numbers up to 81103 share no factor with it.
- 4
The digits of 81103 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 107 steps to reach 1.
LaTeX source of the formulas on this page
\[ 81103 = 11 \times 73 \times 101 \]
81103 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 90576 |
| Euler totient φ(n) | 72000 |
| Square | 6577696609 |
| Cube | 533470928079727 |
| Square root | 284.785884 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 107 |
| Scientific notation | 8.1103 × |
81103 in other forms
| Form | Value |
|---|---|
| In words | eighty-one thousand one hundred and three |
| Binary (base 2) | 10011110011001111 |
| Octal (base 8) | 236317 |
| Hexadecimal (base 16) | 13CCF |
| Base 3 | 11010020211 |
| As time | 81103 seconds = 22 h 31 min 43 s |
Is 81103 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 3) | 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 7) | 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 3) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (81103 ÷ 11 = 7373) | 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 81103 a prime number?
No. 81103 = 11 × 73 × 101, so it is divisible by 11.
What are the factors of 81103?
1, 11, 73, 101, 803, 1111, 7373, 81103.
What is 81103 in binary?
10011110011001111 (hexadecimal 13CCF, octal 236317).
What is the square root of 81103?
About 284.7859.
Is 81103 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 81103?
It is a composite number with 8 divisors.