The number 31613
31613 is a palindrome: it reads 31613 backwards too. Its prime factorisation is 101 × 313. Divisors (4): 1, 101, 313, 31613.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 31613: a palindrome: it reads 31613 backwards too; a semiprime: 101 × 313, the product of two primes.
- 2
31613 is composite. Its prime factorisation is
- 3
The divisors add up to 32028; without 31613 itself that is 415, so 31613 is deficient (415 is less than 31613). Euler's totient φ(31613) = 31200 numbers up to 31613 share no factor with it.
- 4
The digits of 31613 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 77 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31613 = 101 \times 313 \]
31613 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 32028 |
| Euler totient φ(n) | 31200 |
| Square | 999381769 |
| Cube | 31593455863397 |
| Square root | 177.800450 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 77 |
| Scientific notation | 3.1613 × |
31613 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand six hundred and thirteen |
| Binary (base 2) | 111101101111101 |
| Octal (base 8) | 75575 |
| Hexadecimal (base 16) | 7B7D |
| Base 3 | 1121100212 |
| As time | 31613 seconds = 8 h 46 min 53 s |
Is 31613 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | 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 1) | 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 5) | 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 3) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31613 a prime number?
No. 31613 = 101 × 313, so it is divisible by 101.
What are the factors of 31613?
1, 101, 313, 31613.
What is 31613 in binary?
111101101111101 (hexadecimal 7B7D, octal 75575).
What is the square root of 31613?
About 177.8004.
Is 31613 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 31613?
31613 is a palindrome: it reads 31613 backwards too; a semiprime: 101 × 313, the product of two primes.