Properties of the Number 81340

Eighty-One Thousand Three Hundred Forty

Basics

Value: 81339 → 81340 → 81341

Parity: even

Prime: No

Previous Prime: 81331

Next Prime: 81343

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 7 ² × 83

Divisors: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110110111100

Octal: 236674

Duodecimal: 3B0A4

Hexadecimal: 13dbc

Square: 6616195600

Square Root: 285.20168302448707

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

Gaussian column reduction of Hankel matrix for central Delannoy numbers. A118384

Antidiagonal sums of the convolution array A213833. A213834

a(n) = ∑_k=0..n 2^k * binomial(n+2,k) * binomial(n+2,k+2). A387337

Variant sequence generated by solving the order n·n linear problem [H]x = b where b is the unit vector and the sequence term is given by the denominator of the last unknown xn. A124265

a(n) = (5ⁿ+(-1)ⁿ)/2. A81340

Triangle, read by rows of 2·n+1 terms, where row n lists the coefficients in (1+3·x+2·x²)ⁿ. A200536