Properties of the Number 81265

Eighty-One Thousand Two Hundred Sixty-Five

Basics

Value: 81264 → 81265 → 81266

Parity: odd

Prime: No

Previous Prime: 81239

Next Prime: 81281

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 5 × 16253

Divisors: 1, 5, 16253, 81265

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110101110001

Octal: 236561

Duodecimal: 3B041

Hexadecimal: 13d71

Square: 6604000225

Square Root: 285.07016680108774

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

Triangle T(n,k) read by rows: the coefficient [xⁿ] of x²/(1-(k+1)*x-x³) in row n, columns 0 <= k <= n. A117716

Numbers equal to a permutation (or rearrangement) of the digits of the sum of their proper divisors (excluding the proper divisor 1). Rearrangements which cause leading zeros are excluded. A86248

Expansion of 1/(1-5·x-x³). A99524

Triangle of coefficients of the polynomials a(n, x) = 2·a(n-1, x)+ x²*a(n-2,x), n >= 1, a(0, x) = 1, a(1, x) = 1. A81265

Number of nX6 0..1 arrays with every element unequal to 0, 1, 2, 5 or 8 king-move adjacent elements, with upper left element zero. A305338