Properties of the Number 81644

Eighty-One Thousand Six Hundred Forty-Four

Basics

Value: 81643 → 81644 → 81645

Parity: even

Prime: No

Previous Prime: 81637

Next Prime: 81647

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 20411

Divisors: 1, 2, 4, 20411, 40822, 81644

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011111011101100

Octal: 237354

Duodecimal: 3B2B8

Hexadecimal: 13eec

Square: 6665742736

Square Root: 285.7341421671551

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

Sums of squared terms in rows of triangle A112555. A112556

Unsigned row sums of triangle A114700. A116466

Integers congruent to 0, 1, 4, 9 or 16 (mod 25) which are not squares. A81644