Properties of the Number 81839

Eighty-One Thousand Eight Hundred Thirty-Nine

Basics

Value: 81838 → 81839 → 81840

Parity: odd

Prime: Yes

Previous Prime: 81817

Next Prime: 81847

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 81839

Divisors: 1, 81839

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111110101111

Octal: 237657

Duodecimal: 3B43B

Hexadecimal: 13faf

Square: 6697621921

Square Root: 286.0751649479556

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

Indices of prime Fibonacci numbers. A1605

Prime indices of prime Fibonacci numbers. A83668

Number of factorization patterns of polynomials of degree n over F₂. A6167

a(n) = numerator of b(n): b(n) = the maximum possible value for a continued fraction whose terms are a permutation of the terms of the simple continued fraction for H(n) = sum{k=1 to n} 1/k, the n-th harmonic number. A129082

Numbers n such that 137·2ⁿ + 1 is a prime. A32418

Numbers n such that the n-th Fibonacci number is prime and can be written in the form a² + 3·b². A216552

Primes p such that 100p-1, 100p-3, 100p-7, and 100p-9 are all prime. A243409

a(n) is the least prime p such that (p²-2·n)/(2·n-1) and (p²+2·n)/(2·n+1) are both prime, or 0 if such p does not exist. A344463

Numbers n such that the n-th Fibonacci number is prime and can be written in the form a² + 7·b². A216535

Numbers n such that the n-th Fibonacci number is prime and can be written in the form a² + 2·b². A216558