The number 31071
31071 is a composite number with 4 divisors. Its prime factorisation is 3 × 10357. Divisors (4): 1, 3, 10357, 31071.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 31071: a semiprime: 3 × 10357, the product of two primes.
- 2
31071 is composite. Its prime factorisation is
- 3
The divisors add up to 41432; without 31071 itself that is 10361, so 31071 is deficient (10361 is less than 31071). Euler's totient φ(31071) = 20712 numbers up to 31071 share no factor with it.
- 4
The digits of 31071 add up to 12, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 116 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31071 = 3 \times 10357 \]
31071 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 41432 |
| Euler totient φ(n) | 20712 |
| Square | 965407041 |
| Cube | 29996162170911 |
| Square root | 176.269680 |
| Digit sum / digital root | 12 / 3 |
| Collatz steps to 1 | 116 |
| Scientific notation | 3.1071 × |
31071 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand and seventy-one |
| Binary (base 2) | 111100101011111 |
| Octal (base 8) | 74537 |
| Hexadecimal (base 16) | 795F |
| Base 3 | 1120121210 |
| As time | 31071 seconds = 8 h 37 min 51 s |
Is 31071 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 | Yes (31071 ÷ 3 = 10357) | 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 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 3) | 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 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31071 a prime number?
No. 31071 = 3 × 10357, so it is divisible by 3.
What are the factors of 31071?
1, 3, 10357, 31071.
What is 31071 in binary?
111100101011111 (hexadecimal 795F, octal 74537).
What is the square root of 31071?
About 176.2697.
Is 31071 divisible by 3?
Yes. Its digits add up to 12, a multiple of 3.
What is special about the number 31071?
31071 is a semiprime: 3 × 10357, the product of two primes.