The number 31055
31055 is a binary palindrome (111100101001111). Its prime factorisation is 5 × 6211. Divisors (4): 1, 5, 6211, 31055.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 31055: a binary palindrome (111100101001111); a semiprime: 5 × 6211, the product of two primes.
- 2
31055 is composite. Its prime factorisation is
- 3
The divisors add up to 37272; without 31055 itself that is 6217, so 31055 is deficient (6217 is less than 31055). Euler's totient φ(31055) = 24840 numbers up to 31055 share no factor with it.
- 4
The digits of 31055 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 116 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31055 = 5 \times 6211 \]
31055 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 37272 |
| Euler totient φ(n) | 24840 |
| Square | 964413025 |
| Cube | 29949846491375 |
| Square root | 176.224289 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 116 |
| Scientific notation | 3.1055 × |
31055 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand and fifty-five |
| Binary (base 2) | 111100101001111 |
| Octal (base 8) | 74517 |
| Hexadecimal (base 16) | 794F |
| Base 3 | 1120121012 |
| As time | 31055 seconds = 8 h 37 min 35 s |
Is 31055 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 2) | 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 (31055 ÷ 5 = 6211) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | 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 7) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31055 a prime number?
No. 31055 = 5 × 6211, so it is divisible by 5.
What are the factors of 31055?
1, 5, 6211, 31055.
What is 31055 in binary?
111100101001111 (hexadecimal 794F, octal 74517).
What is the square root of 31055?
About 176.2243.
Is 31055 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 31055?
31055 is a binary palindrome (111100101001111); a semiprime: 5 × 6211, the product of two primes.