The number 1099
1099 is a composite number with 4 divisors. Its prime factorisation is 7 × 157. Divisors (4): 1, 7, 157, 1099.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 1099: a semiprime: 7 × 157, the product of two primes.
- 2
1099 is composite. Its prime factorisation is
- 3
The divisors add up to 1264; without 1099 itself that is 165, so 1099 is deficient (165 is less than 1099). Euler's totient φ(1099) = 936 numbers up to 1099 share no factor with it.
- 4
The digits of 1099 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 31 steps to reach 1.
LaTeX source of the formulas on this page
\[ 1099 = 7 \times 157 \]
1099 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 1264 |
| Euler totient φ(n) | 936 |
| Square | 1207801 |
| Cube | 1327373299 |
| Square root | 33.151169 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 31 |
| Scientific notation | 1.099 × |
1099 in other forms
| Form | Value |
|---|---|
| In words | one thousand and ninety-nine |
| Roman numerals | MXCIX |
| Binary (base 2) | 10001001011 |
| Octal (base 8) | 2113 |
| Hexadecimal (base 16) | 44B |
| Base 3 | 1111201 |
| As time | 1099 seconds = 18 min 19 s |
Is 1099 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 4) | 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 (1099 ÷ 7 = 157) | 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 9) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 1099 a prime number?
No. 1099 = 7 × 157, so it is divisible by 7.
What are the factors of 1099?
1, 7, 157, 1099.
What is 1099 in binary?
10001001011 (hexadecimal 44B, octal 2113).
What is the square root of 1099?
About 33.1512.
What is 1099 in Roman numerals?
MXCIX.
Is 1099 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 1099?
1099 is a semiprime: 7 × 157, the product of two primes.