Properties of the Number 81621

Eighty-One Thousand Six Hundred Twenty-One

Basics

Value: 81620 → 81621 → 81622

Parity: odd

Prime: No

Previous Prime: 81619

Next Prime: 81629

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 3023

Divisors: 1, 3, 9, 27, 3023, 9069, 27207, 81621

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111011010101

Octal: 237325

Duodecimal: 3B299

Hexadecimal: 13ed5

Square: 6661987641

Square Root: 285.69389212932083

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

Antidiagonal sums of A086272 (and of A086273). A86274

Number of n-node triangulations of the sphere with minimal degree 5. A81621