The number 55531
55531 is a composite number with 4 divisors. Its prime factorisation is 7 × 7933. Divisors (4): 1, 7, 7933, 55531.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 55531: a semiprime: 7 × 7933, the product of two primes.
- 2
55531 is composite. Its prime factorisation is
- 3
The divisors add up to 63472; without 55531 itself that is 7941, so 55531 is deficient (7941 is less than 55531). Euler's totient φ(55531) = 47592 numbers up to 55531 share no factor with it.
- 4
The digits of 55531 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 184 steps to reach 1.
LaTeX source of the formulas on this page
\[ 55531 = 7 \times 7933 \]
55531 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 63472 |
| Euler totient φ(n) | 47592 |
| Square | 3083691961 |
| Cube | 171240498286291 |
| Square root | 235.650164 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 184 |
| Scientific notation | 5.5531 × |
55531 in other forms
| Form | Value |
|---|---|
| In words | fifty-five thousand five hundred and thirty-one |
| Binary (base 2) | 1101100011101011 |
| Octal (base 8) | 154353 |
| Hexadecimal (base 16) | D8EB |
| Base 3 | 2211011201 |
| As time | 55531 seconds = 15 h 25 min 31 s |
Is 55531 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 | No (remainder 1) | 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 (55531 ÷ 7 = 7933) | 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 1) | 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 55531 a prime number?
No. 55531 = 7 × 7933, so it is divisible by 7.
What are the factors of 55531?
1, 7, 7933, 55531.
What is 55531 in binary?
1101100011101011 (hexadecimal D8EB, octal 154353).
What is the square root of 55531?
About 235.6502.
Is 55531 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 55531?
55531 is a semiprime: 7 × 7933, the product of two primes.