The number 71155
71155 is a composite number with 16 divisors. Its prime factorisation is 5 × 7 × 19 × 107. Divisors (16): 1, 5, 7, 19, 35, 95, 107, 133, 535, 665, 749, 2033, 3745, 10165, 14231, 71155.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 71155: a Harshad number: divisible by its digit sum 19.
- 2
71155 is composite. Its prime factorisation is
- 3
The divisors add up to 103680; without 71155 itself that is 32525, so 71155 is deficient (32525 is less than 71155). Euler's totient φ(71155) = 45792 numbers up to 71155 share no factor with it.
- 4
The digits of 71155 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 125 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71155 = 5 \times 7 \times 19 \times 107 \]
71155 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 103680 |
| Euler totient φ(n) | 45792 |
| Square | 5063034025 |
| Cube | 360260186048875 |
| Square root | 266.748946 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 125 |
| Scientific notation | 7.1155 × |
71155 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand one hundred and fifty-five |
| Binary (base 2) | 10001010111110011 |
| Octal (base 8) | 212763 |
| Hexadecimal (base 16) | 115F3 |
| Base 3 | 10121121101 |
| As time | 71155 seconds = 19 h 45 min 55 s |
Is 71155 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 | Yes (71155 ÷ 5 = 14231) | 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 | Yes (71155 ÷ 7 = 10165) | 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 3) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | 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 71155 a prime number?
No. 71155 = 5 × 7 × 19 × 107, so it is divisible by 5.
What are the factors of 71155?
1, 5, 7, 19, 35, 95, 107, 133, 535, 665, 749, 2033, 3745, 10165, 14231, 71155.
What is 71155 in binary?
10001010111110011 (hexadecimal 115F3, octal 212763).
What is the square root of 71155?
About 266.7489.
Is 71155 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 71155?
71155 is a Harshad number: divisible by its digit sum 19.