The number 81014
81014 is a composite number with 4 divisors. Its prime factorisation is 2 × 40507. Divisors (4): 1, 2, 40507, 81014.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 81014: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 40507, the product of two primes.
- 2
81014 is composite. Its prime factorisation is
- 3
The divisors add up to 121524; without 81014 itself that is 40510, so 81014 is deficient (40510 is less than 81014). Euler's totient φ(81014) = 40506 numbers up to 81014 share no factor with it.
- 4
The digits of 81014 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 76 steps to reach 1.
LaTeX source of the formulas on this page
\[ 81014 = 2 \times 40507 \]
81014 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 121524 |
| Euler totient φ(n) | 40506 |
| Square | 6563268196 |
| Cube | 531716609630744 |
| Square root | 284.629584 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 76 |
| Scientific notation | 8.1014 × |
81014 in other forms
| Form | Value |
|---|---|
| In words | eighty-one thousand and fourteen |
| Binary (base 2) | 10011110001110110 |
| Octal (base 8) | 236166 |
| Hexadecimal (base 16) | 13C76 |
| Base 3 | 11010010112 |
| As time | 81014 seconds = 22 h 30 min 14 s |
Is 81014 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (81014 ÷ 2 = 40507) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 4) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 81014 a prime number?
No. 81014 = 2 × 40507, so it is divisible by 2.
What are the factors of 81014?
1, 2, 40507, 81014.
What is 81014 in binary?
10011110001110110 (hexadecimal 13C76, octal 236166).
What is the square root of 81014?
About 284.6296.
Is 81014 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 81014?
81014 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 40507, the product of two primes.