The number 56521
56521 is a composite number with 4 divisors. Its prime factorisation is 29 × 1949. Divisors (4): 1, 29, 1949, 56521.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 56521: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 29 × 1949, the product of two primes.
- 2
56521 is composite. Its prime factorisation is
- 3
The divisors add up to 58500; without 56521 itself that is 1979, so 56521 is deficient (1979 is less than 56521). Euler's totient φ(56521) = 54544 numbers up to 56521 share no factor with it.
- 4
The digits of 56521 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 60 steps to reach 1.
LaTeX source of the formulas on this page
\[ 56521 = 29 \times 1949 \]
56521 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 58500 |
| Euler totient φ(n) | 54544 |
| Square | 3194623441 |
| Cube | 180563311508761 |
| Square root | 237.741456 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 60 |
| Scientific notation | 5.6521 × |
56521 in other forms
| Form | Value |
|---|---|
| In words | fifty-six thousand five hundred and twenty-one |
| Binary (base 2) | 1101110011001001 |
| Octal (base 8) | 156311 |
| Hexadecimal (base 16) | DCC9 |
| Base 3 | 2212112101 |
| As time | 56521 seconds = 15 h 42 min 1 s |
Is 56521 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 1) | 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 | 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 1) | 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 56521 a prime number?
No. 56521 = 29 × 1949, so it is divisible by 29.
What are the factors of 56521?
1, 29, 1949, 56521.
What is 56521 in binary?
1101110011001001 (hexadecimal DCC9, octal 156311).
What is the square root of 56521?
About 237.7415.
Is 56521 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 56521?
56521 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 29 × 1949, the product of two primes.