Properties of the Number 80781

Eighty Thousand Seven Hundred Eighty-One

Basics

Value: 80780 → 80781 → 80782

Parity: odd

Prime: No

Previous Prime: 80779

Next Prime: 80783

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 26927

Divisors: 1, 3, 26927, 80781

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011101110001101

Octal: 235615

Duodecimal: 3A8B9

Hexadecimal: 13b8d

Square: 6525569961

Square Root: 284.2199852227144

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 that are the sum of 9 positive 9th powers. A3398

Number of polynomials of height n: a(1)=1, a(2)=1, a(3)=4, a(n) = 2·a(n-1) + a(n-2) + 2 for n >= 4. A5409

Number of maximal primitive subsets of {1..n}. A326077

A sequence of row differences for table A182119. A182188

Row sums of triangle in A152719. A238375

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n)², where a(0) = 1, a(1) = 4, b(0) = 2, b(1) = 3, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences. A296247

Expansion of g.f. (1+8·x-x²)/((1+x)*(1-6·x+x²)). A105058

Trajectory of 3 under map n->43n+1 if n odd, n->n/2 if n even. A37119

Duplicate of A079357. A80781