Properties of the Number 81225

Eighty-One Thousand Two Hundred Twenty-Five

Basics

Value: 81224 → 81225 → 81226

Parity: odd

Prime: No

Previous Prime: 81223

Next Prime: 81233

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 ² × 19 ²

Divisors: 1, 3, 5, 9, 15, 19, 25, 45, 57, 75

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011110101001001

Octal: 236511

Duodecimal: 3B009

Hexadecimal: 13d49

Square: 6597500625

Square Root: 285

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

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

Numbers that are the squares of the product of three distinct primes. A162143

a(n) = (11·n + 10)². A17510

Squares which are the concatenation of two nonzero squares. A39686

Squares with initial digit '8'. A45792

Square numbers that remain square when their most-significant (or leftmost) digit is removed. A225885

a(n+1) is the smallest square ending with a(n), initial term is 5. A61839

a(n) = (10·n + 5)². A17330

a(n+1) is next smallest square not divisible by 10 beginning with a(n), initial term is 8. A249898

a(n) = (8·n + 5)². A17126

k² is a term if k² + (k-1)² and k² + (k+1)² are primes. A75577