The number 31255
31255 is a composite number with 16 divisors. Its prime factorisation is 5 × 7 × 19 × 47. Divisors (16): 1, 5, 7, 19, 35, 47, 95, 133, 235, 329, 665, 893, 1645, 4465, 6251, 31255.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31255 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31255 is composite. Its prime factorisation is
- 3
The divisors add up to 46080; without 31255 itself that is 14825, so 31255 is deficient (14825 is less than 31255). Euler's totient φ(31255) = 19872 numbers up to 31255 share no factor with it.
- 4
The digits of 31255 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 134 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31255 = 5 \times 7 \times 19 \times 47 \]
31255 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 46080 |
| Euler totient φ(n) | 19872 |
| Square | 976875025 |
| Cube | 30532228906375 |
| Square root | 176.790837 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 134 |
| Scientific notation | 3.1255 × |
31255 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand two hundred and fifty-five |
| Binary (base 2) | 111101000010111 |
| Octal (base 8) | 75027 |
| Hexadecimal (base 16) | 7A17 |
| Base 3 | 1120212121 |
| As time | 31255 seconds = 8 h 40 min 55 s |
Is 31255 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 (31255 ÷ 5 = 6251) | 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 (31255 ÷ 7 = 4465) | 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 7) | 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 4) | 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 31255 a prime number?
No. 31255 = 5 × 7 × 19 × 47, so it is divisible by 5.
What are the factors of 31255?
1, 5, 7, 19, 35, 47, 95, 133, 235, 329, 665, 893, 1645, 4465, 6251, 31255.
What is 31255 in binary?
111101000010111 (hexadecimal 7A17, octal 75027).
What is the square root of 31255?
About 176.7908.
Is 31255 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 31255?
It is a composite number with 16 divisors.