Number Classification API

This API takes a number and returns interesting mathematical properties about it, along with a fun fact.

Features

• Determines if a number is prime
• Determines if a number is perfect
• Calculates various number properties (armstrong, odd/even)
• Provides digit sum
• Fetches fun facts about numbers

API Endpoint

GET /api/classify-number?number=371

Success Response (200 OK)

{
  "number": 371,
  "is_prime": false,
  "is_perfect": false,
  "properties": ["armstrong", "odd"],
  "digit_sum": 11,
  "fun_fact": "371 is an Armstrong number because 3^3 + 7^3 + 1^3 = 371"
}

Error Response (400 Bad Request)

{
  "number": "alphabet",
  "error": true
}

Setup and Installation

1. Clone the repository
2. Install dependencies:

   npm install

3. Start the server:

   npm start

Technologies Used

• Node.js
• Express
• TypeScript
• Axios (for external API calls)

Environment Variables

Create a .env file in the root directory with the following variables:

PORT=3000

License

ISC