Properties of the Number 81875

Eighty-One Thousand Eight Hundred Seventy-Five

Basics

Value: 81874 → 81875 → 81876

Parity: odd

Prime: No

Previous Prime: 81869

Next Prime: 81883

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 5 ⁴ × 131

Divisors: 1, 5, 25, 125, 131, 625, 655, 3275, 16375, 81875

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011111111010011

Octal: 237723

Duodecimal: 3B46B

Hexadecimal: 13fd3

Square: 6703515625

Square Root: 286.1380785564899

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 sum of six fourth powers in seven or more ways. A345564

Numbers that are the sum of six fourth powers in exactly seven ways. A345819

Expansion of (1-5·x-sqrt((1-5·x)²-4·5*x²))/(2·5*x²). A107265

a(n) = a(n-1) + 3·a(n-2) - 3·a(n-3) - 2·a(n-4) + 2·a(n-5) for n >= 6, a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 11, a(4) = 18, a(5) = 28. A289131

A square array of Motzkin related transforms, read by antidiagonals. A107267

a(n) = ∑_d∣n φ(n/d)*C(2·d,d)/2. A81875