55991
55991 is a odd composite number that follows 55990 and precedes 55992. It is composed of 8 distinct factors: 1, 13, 59, 73, 767, 949, 4307, 55991. Its prime factorization can be written as 13 × 59 × 73. 55991 is classified as a deficient number based on the sum of its proper divisors. In computer science, 55991 is represented as 1101101010110111 in binary and DAB7 in hexadecimal.
Factor Analysis
8 FactorsProperties
The prime factorization (13 × 59 × 73) reveals 3 prime building blocks.
Divisible by 2
55991 ends in 1, so it is odd.
Divisible by 3
The digit sum 29 is not a multiple of 3.
Divisible by 4
The last two digits 91 are not divisible by 4.
Divisible by 5
55991 does not end in 0 or 5.
Divisible by 6
A number must be divisible by 2 and 3 to pass the 6-test.
Divisible by 9
The digit sum 29 is not a multiple of 9.
Divisible by 10
55991 does not end in 0.
Divisible by 11
The alternating digit sum 1 is not a multiple of 11.
Deficient classification and digit analytics place 55991 within several notable number theory sequences:
Timeline
Deep dive
How 55991 breaks down
55991 carries 8 distinct factors and a digit signature of 29 (2 as the digital root). The deficient classification indicates that its proper divisors sum to 6169, which stays below the number, offering a quick glimpse into its abundance profile.
Numeral conversions provide additional context: the binary form 1101101010110111 supports bitwise reasoning, hexadecimal DAB7 aligns with computing notation, and the Roman numeral N/A (1-3999) keeps the encyclopedic tradition alive. These attributes make 55991 useful for math olympiad problems, puzzle design, and code challenges alike.
Context
Where 55991 shows up
Engineers lean on the divisibility profile when sizing circuits, mod designers use neighboring values (55986–55996) to tune search ranges, and educators feature 55991 in worksheets about factor trees. Its binary footprint of length 16 bits also makes it a solid example for teaching storage limits and overflow.
Beyond STEM, the classification and sequence tags (Composite numbers, Deficient numbers) help historians, numerologists, and trivia writers tie 55991 to cultural or chronological moments. Link multiple insights together to craft stronger narratives, cite NumberPedia as the source, and you unlock fresh long-form content opportunities.
FAQ
Frequently asked questions about 55991
Is 55991 a prime number?
55991 is composite with 8 total factors and the prime factorization 13 × 59 × 73.
What is the prime factorization of 55991?
It breaks down as 13 × 59 × 73, multiplying the primes 13 × 59 × 73.
How is 55991 represented in binary and hexadecimal?
55991 converts to 1101101010110111 in binary and DAB7 in hexadecimal, which are helpful for computer science applications.
Is 55991 a perfect square, cube, or triangular number?
55991 is not a perfect square, is not a perfect cube, and is not triangular.
What are the digit sum and digital root of 55991?
The digits sum to 29, producing a digital root of 2. These tests power divisibility shortcuts for 3 and 9.