Properties of the Number 225

Two Hundred Twenty-Five

Basics

Value: 224 → 225 → 226

Parity: odd

Prime: No

Previous Prime: 223

Next Prime: 227

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 ²

Divisors: 1, 3, 5, 9, 15, 25, 45, 75, 225

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11100001

Octal: 341

Duodecimal: 169

Hexadecimal: e1

Square: 50625

Square Root: 15

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Coordination sequence for planar net 3.3.3.3.6 (also called the fsz net). A250120

The squares: a(n) = n². A290

Completely multiplicative with a(prime(k)) = prime(k+1). A3961

Perfect powers: m^k where m > 0 and k >= 2. A1597

Primorial base exp-function: digits in primorial base representation of n become the exponents of successive prime factors whose product a(n) is. A276086

Powerful numbers, definition (1): if a prime p divides n then p² must also divide n (also called squareful, square full, square-full or 2-powerful numbers). A1694

Quarter-squares: a(n) = floor(n/2)*ceiling(n/2). Equivalently, a(n) = floor(n²/4). A2620

The Doudna sequence: write n-1 in binary; power of prime(k) in a(n) is # of 1's that are followed by k-1 0's. A5940

Odd squares: a(n) = (2n+1)². Also centered octagonal numbers. A16754

a(n) = 4·n + 1. A16813

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