The number 31553
31553 is a composite number with 4 divisors. Its prime factorisation is 139 × 227. Divisors (4): 1, 139, 227, 31553.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 31553: a semiprime: 139 × 227, the product of two primes.
- 2
31553 is composite. Its prime factorisation is
- 3
The divisors add up to 31920; without 31553 itself that is 367, so 31553 is deficient (367 is less than 31553). Euler's totient φ(31553) = 31188 numbers up to 31553 share no factor with it.
- 4
The digits of 31553 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 28 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31553 = 139 \times 227 \]
31553 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 31920 |
| Euler totient φ(n) | 31188 |
| Square | 995591809 |
| Cube | 31413908349377 |
| Square root | 177.631641 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 28 |
| Scientific notation | 3.1553 × |
31553 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand five hundred and fifty-three |
| Binary (base 2) | 111101101000001 |
| Octal (base 8) | 75501 |
| Hexadecimal (base 16) | 7B41 |
| Base 3 | 1121021122 |
| As time | 31553 seconds = 8 h 45 min 53 s |
Is 31553 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 4) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 5) | 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 31553 a prime number?
No. 31553 = 139 × 227, so it is divisible by 139.
What are the factors of 31553?
1, 139, 227, 31553.
What is 31553 in binary?
111101101000001 (hexadecimal 7B41, octal 75501).
What is the square root of 31553?
About 177.6316.
Is 31553 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 31553?
31553 is a semiprime: 139 × 227, the product of two primes.