Properties of the Number 81811

Eighty-One Thousand Eight Hundred Eleven

Basics

Value: 81810 → 81811 → 81812

Parity: odd

Prime: No

Previous Prime: 81799

Next Prime: 81817

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 23 × 3557

Divisors: 1, 23, 3557, 81811

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111110010011

Octal: 237623

Duodecimal: 3B417

Hexadecimal: 13f93

Square: 6693039721

Square Root: 286.02622257408495

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

Total number of nodes summed over all lattice paths from (0,0) to (n,n) using steps {(k,0), (0,k) | 0<k<=4} which never go above the diagonal x=y. A286918

The Wiener index of the graph \|/_\/_\/_..._\/_\|/ having n nodes on the horizontal path. A180571

Semiprimes formed by concatenating n, n, and 1 for n = 1, 2, 3,.... A210711

If n = p₁^e_1 * ... * p_k^e_k, p₁ < ... < p_k primes, then a(n) = min{ p_i*e_i }. A81811