The number 70081
70081 is a composite number with 8 divisors. Its prime factorisation is 11 × 23 × 277. Divisors (8): 1, 11, 23, 253, 277, 3047, 6371, 70081.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
70081 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
70081 is composite. Its prime factorisation is
- 3
The divisors add up to 80064; without 70081 itself that is 9983, so 70081 is deficient (9983 is less than 70081). Euler's totient φ(70081) = 60720 numbers up to 70081 share no factor with it.
- 4
The digits of 70081 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 104 steps to reach 1.
LaTeX source of the formulas on this page
\[ 70081 = 11 \times 23 \times 277 \]
70081 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 80064 |
| Euler totient φ(n) | 60720 |
| Square | 4911346561 |
| Cube | 344192078341441 |
| Square root | 264.728162 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 104 |
| Scientific notation | 7.0081 × |
70081 in other forms
| Form | Value |
|---|---|
| In words | seventy thousand and eighty-one |
| Binary (base 2) | 10001000111000001 |
| Octal (base 8) | 210701 |
| Hexadecimal (base 16) | 111C1 |
| Base 3 | 10120010121 |
| As time | 70081 seconds = 19 h 28 min 1 s |
Is 70081 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 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 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 | Yes (70081 ÷ 11 = 6371) | 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 70081 a prime number?
No. 70081 = 11 × 23 × 277, so it is divisible by 11.
What are the factors of 70081?
1, 11, 23, 253, 277, 3047, 6371, 70081.
What is 70081 in binary?
10001000111000001 (hexadecimal 111C1, octal 210701).
What is the square root of 70081?
About 264.7282.
Is 70081 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 70081?
It is a composite number with 8 divisors.