Properties of the Number 81019

Eighty-One Thousand Nineteen

Basics

Value: 81018 → 81019 → 81020

Parity: odd

Prime: Yes

Previous Prime: 81017

Next Prime: 81023

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 81019

Divisors: 1, 81019

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110001111011

Octal: 236173

Duodecimal: 3AA77

Hexadecimal: 13c7b

Square: 6564078361

Square Root: 284.63836705546214

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

Primes p such that A001177(p) = (p-1)/9. A308802

T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero. A298396

Upper twin primes of upper twin prime index. A88463

Floor-Sqrt transform of Catalan numbers (A000108). A186546

Primes obtained from other primes by prefixing an 8. A290407

Number of nX5 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero. A298393

Number of nX7 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero. A298395

a(n) = Lucas(4n+3) - 1, or Lucas(2n+1)*Lucas(2n+2). A81019