Math Files(@Math_files):The number 153 belongs to a special class of numbers that are equal to the sum of powers of their digits. In other words, these are n-digit numbers that equal the sum of the nᵗʰ powers of their own digits. For example, 153 = 1³ + 5³ + 3³ Such numbers are known by various names—narcissistic numbers, Armstrong numbers, “numbers in love with themselves,” or perfect digital invariants. These remarkable numbers have fascinated number theorists for decades.

2026.05.16 22:30

The number 153 belongs to a special class of numbers that are equal to the sum of powers of their digits. In other words, these are n-digit numbers that equal the sum of the nᵗʰ powers of their own digits. For example, 153 = 1³ + 5³ + 3³ Such numbers are known by various names—narcissistic numbers, Armstrong numbers, “numbers in love with themselves,” or perfect digital invariants. These remarkable numbers have fascinated number theorists for decades.