Properties of the Number 81071

Eighty-One Thousand Seventy-One

Basics

Value: 81070 → 81071 → 81072

Parity: odd

Prime: Yes

Previous Prime: 81049

Next Prime: 81077

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 81071

Divisors: 1, 81071

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011110010101111

Octal: 236257

Duodecimal: 3AABB

Hexadecimal: 13caf

Square: 6572507041

Square Root: 284.7296963788639

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

Number of vertices in a complete bipartite graph where the n vertices of each part are placed on the vertices, and on opposite sides, of a regular 2n-gon. A392971

Boustrophedon transform of the signed Jacobsthal numbers. A101474

Number of 5-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first differences in -n..n. A208996

a(n) = Lucas(4·n+2)-2 = Lucas(2·n+1)². A81071