Properties of the Number 81475

Eighty-One Thousand Four Hundred Seventy-Five

Basics

Value: 81474 → 81475 → 81476

Parity: odd

Prime: No

Previous Prime: 81463

Next Prime: 81509

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 5 ² × 3259

Divisors: 1, 5, 25, 3259, 16295, 81475

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111001000011

Octal: 237103

Duodecimal: 3B197

Hexadecimal: 13e43

Square: 6638175625

Square Root: 285.4382595238417

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

Principal diagonal of the convolution array A213844. A213845

Consider the mapping f(x/y) = (x+y)/(2xy) where x/y is a reduced fraction. Beginning with x₀ = 1 and y₀ = 2, repeated application of this mapping produces a sequence of fractions x_n/y_n; a(n) is the n-th numerator. A81475