Properties of the Number 81797

Eighty-One Thousand Seven Hundred Ninety-Seven

Basics

Value: 81796 → 81797 → 81798

Parity: odd

Prime: No

Previous Prime: 81773

Next Prime: 81799

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 157 × 521

Divisors: 1, 157, 521, 81797

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111110000101

Octal: 237605

Duodecimal: 3B405

Hexadecimal: 13f85

Square: 6690749209

Square Root: 286.00174824640493

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

Expansion of (1 - 3·x + 2·x²)/(1 - 4·x + 3·x² + x³). A121449

G.f.: 1/(1 - x*(1-x⁵)/(1 - x²*(1-x⁶)/(1 - x³*(1-x⁷)/(1 - x⁴*(1-x⁸)/(1 - x⁵*(1-x⁹)/(1 - ...)))))), a continued fraction. A227374

Brilliant numbers such that when they are concatenated with their 10's complement, which also must be brilliant, the result is a prime. A84629

Numbers of the form n² + 1 without prime divisors of the form a² + 1. A217279

a(1) = 2, a(n) = k + 1, where k is the least number greater than a(n-1) such that rad(k) | a(n-1), where rad(n) = A007947(n). A365324

Squarefree terms of A129802 whose prime factors are neither elite (A102742) nor anti-elite (A128852), where A129802 is the possible bases for Pepin's primality test for Fermat numbers. A372895

Maximal coefficient (in absolute value) of the minimal polynomial P with integer coefficients such that P(sin(π/n)) = 0. A81797