Properties of the Number 81459

Eighty-One Thousand Four Hundred Fifty-Nine

Basics

Value: 81458 → 81459 → 81460

Parity: odd

Prime: No

Previous Prime: 81457

Next Prime: 81463

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 7 × 431

Divisors: 1, 3, 7, 9, 21, 27, 63, 189, 431, 1293

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111000110011

Octal: 237063

Duodecimal: 3B183

Hexadecimal: 13e33

Square: 6635568681

Square Root: 285.41023107099716

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 k such that 201·2^k-1 is prime. A50852

Consider the mapping f(r) = (1/2)*(r + N/r) from rationals to rationals where N = 5. Starting with r = 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 numerators. A81459