The number 13555
13555 is a composite number with 4 divisors. Its prime factorisation is 5 × 2711. Divisors (4): 1, 5, 2711, 13555.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 13555: a semiprime: 5 × 2711, the product of two primes.
- 2
13555 is composite. Its prime factorisation is
- 3
The divisors add up to 16272; without 13555 itself that is 2717, so 13555 is deficient (2717 is less than 13555). Euler's totient φ(13555) = 10840 numbers up to 13555 share no factor with it.
- 4
The digits of 13555 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 89 steps to reach 1.
LaTeX source of the formulas on this page
\[ 13555 = 5 \times 2711 \]
13555 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 16272 |
| Euler totient φ(n) | 10840 |
| Square | 183738025 |
| Cube | 2490568928875 |
| Square root | 116.425942 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 89 |
| Scientific notation | 1.3555 × |
13555 in other forms
| Form | Value |
|---|---|
| In words | thirteen thousand five hundred and fifty-five |
| Binary (base 2) | 11010011110011 |
| Octal (base 8) | 32363 |
| Hexadecimal (base 16) | 34F3 |
| Base 3 | 200121001 |
| As time | 13555 seconds = 3 h 45 min 55 s |
Is 13555 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 (13555 ÷ 5 = 2711) | 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 | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | 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 3) | 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 13555 a prime number?
No. 13555 = 5 × 2711, so it is divisible by 5.
What are the factors of 13555?
1, 5, 2711, 13555.
What is 13555 in binary?
11010011110011 (hexadecimal 34F3, octal 32363).
What is the square root of 13555?
About 116.4259.
Is 13555 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 13555?
13555 is a semiprime: 5 × 2711, the product of two primes.