157
157 is a odd prime number that follows 156 and precedes 158. As a prime number, 157 is only divisible by 1 and itself. It holds a unique position in the sequence of integers. Its prime factorization is simply 157. 157 is classified as a deficient number based on the sum of its proper divisors. In computer science, 157 is represented as 10011101 in binary and 9D in hexadecimal. Historically, it is written as CLVII in Roman numerals.
Factor Analysis
2 FactorsProperties
157 is prime, so its only factors are 1 and 157.
Divisible by 2
157 ends in 7, so it is odd.
Divisible by 3
The digit sum 13 is not a multiple of 3.
Divisible by 4
The last two digits 57 are not divisible by 4.
Divisible by 5
157 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 13 is not a multiple of 9.
Divisible by 10
157 does not end in 0.
Divisible by 11
The alternating digit sum 3 is not a multiple of 11.
Deficient classification and digit analytics place 157 within several notable number theory sequences:
Timeline
Deep dive
How 157 breaks down
157 carries 2 distinct factors and a digit signature of 13 (4 as the digital root). The deficient classification indicates that its proper divisors sum to 1, which stays below the number, offering a quick glimpse into its abundance profile.
Numeral conversions provide additional context: the binary form 10011101 supports bitwise reasoning, hexadecimal 9D aligns with computing notation, and the Roman numeral CLVII keeps the encyclopedic tradition alive. These attributes make 157 useful for math olympiad problems, puzzle design, and code challenges alike.
Context
Where 157 shows up
Engineers lean on the divisibility profile when sizing circuits, mod designers use neighboring values (152–162) to tune search ranges, and educators feature 157 in worksheets about prime identification. Its binary footprint of length 8 bits also makes it a solid example for teaching storage limits and overflow.
Beyond STEM, the classification and sequence tags (Prime numbers, Deficient numbers) help historians, numerologists, and trivia writers tie 157 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 157
Is 157 a prime number?
157 is prime, meaning it is only divisible by 1 and itself.
What is the prime factorization of 157?
157 is already prime, so the factorization is simply 157.
How is 157 represented in binary and hexadecimal?
157 converts to 10011101 in binary and 9D in hexadecimal, which are helpful for computer science applications.
Is 157 a perfect square, cube, or triangular number?
157 is not a perfect square, is not a perfect cube, and is not triangular.
What are the digit sum and digital root of 157?
The digits sum to 13, producing a digital root of 4. These tests power divisibility shortcuts for 3 and 9.