Properties of the Number 81790

Eighty-One Thousand Seven Hundred Ninety

Basics

Value: 81789 → 81790 → 81791

Parity: even

Prime: No

Previous Prime: 81773

Next Prime: 81799

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 × 8179

Divisors: 1, 2, 5, 10, 8179, 16358, 40895, 81790

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111101111110

Octal: 237576

Duodecimal: 3B3BA

Hexadecimal: 13f7e

Square: 6689604100

Square Root: 285.98951029714357

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

a(0) = 1, a(1) = 4, and a(n) = a(n-1) + a(n-2) for n >= 2. A285

Fibonacci sequence with initial values a(0) = 3 and a(1) = 1. A104449

Expansion of (1+2·x)/(1-3·x+x²). A54486

y-values in the solution to x² - 20·y² = 176. A228208

(2,2)-block array, B(2,1), of the Wythoff array (A035513), read by descending antidiagonals. A361994

a(n) = a(n-1) + 3·a(n-2) -2·a(n-3) - 2·a(n-4), where a(0) = 1, a(1) = 3, a(2) = 5, a(3) = 7. A295717

a(n) = sum of numbers formed using the digits of next n numbers. A81993

Continued cotangent for tan(1). A81790