Properties of the Number 81460

Eighty-One Thousand Four Hundred Sixty

Basics

Value: 81459 → 81460 → 81461

Parity: even

Prime: No

Previous Prime: 81457

Next Prime: 81463

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 5 × 4073

Divisors: 1, 2, 4, 5, 10, 20, 4073, 8146, 16292, 20365

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111000110100

Octal: 237064

Duodecimal: 3B184

Hexadecimal: 13e34

Square: 6635731600

Square Root: 285.41198292993937

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

Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal or vertical neighbor, and containing the value n(n+1)/2-2. A211905

Consider the mapping f(r) = (1/2)*(r + N/r) from rationals to rationals where N = 5. Starting with a = 2 and applying the mapping to each new (reduced) rational number gives 2, 9/4, 161/72, 51841/23184, ..., tending to N^1/2. Sequence gives values of the denominators. A81460