Validates whether a number is an Armstrong number (narcissistic number) — where the sum of its digits raised to the power of digit count equals the original number. Access via MCP in Cursor or Windsurf for instant verification, or hit GET /v1/number/is-armstrong with your number. Example: 153 is Armstrong because 1³ + 5³ + 3³ = 153. Returns deterministic boolean result.
curl "https://tinyfn.io/v1/number/is-armstrong" \
-H "X-API-Key: YOUR_API_KEY"const response = await fetch('https://tinyfn.io/v1/number/is-armstrong', {
headers: { 'X-API-Key': 'YOUR_API_KEY' }
});
const data = await response.json();
console.log(data);import requests
response = requests.get('https://tinyfn.io/v1/number/is-armstrong',
headers={'X-API-Key': 'YOUR_API_KEY'})
data = response.json()
print(data)Connect your AI agent (Claude, Cursor, Windsurf, etc.) to TinyFn's number tools:
{
"mcpServers": {
"tinyfn-number": {
"url": "https://tinyfn.io/mcp/number",
"headers": {
"X-API-Key": "YOUR_API_KEY"
}
}
}
}An Armstrong number equals the sum of its digits raised to the power of the total digit count. For 153: 1³ + 5³ + 3³ = 1 + 125 + 27 = 153.
Call the is-armstrong tool from any MCP-enabled editor like Cursor or Claude Code with your number parameter. Returns true/false instantly without manual calculation.
They're the same concept — narcissistic number is the mathematical term, Armstrong number is the common programming term. Both follow identical calculation rules.
Works with any positive integer. Single digits (0-9) are always Armstrong numbers since n¹ = n. Multi-digit examples include 153, 371, 9474.
Returns a boolean JSON response indicating whether the input number satisfies the Armstrong number condition. No ambiguous text responses.
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