Properties of the Number 81389

Eighty-One Thousand Three Hundred Eighty-Nine

Basics

Value: 81388 → 81389 → 81390

Parity: odd

Prime: No

Previous Prime: 81373

Next Prime: 81401

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 7 ² × 11 × 151

Divisors: 1, 7, 11, 49, 77, 151, 539, 1057, 1661, 7399

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110111101101

Octal: 236755

Duodecimal: 3B125

Hexadecimal: 13ded

Square: 6624169321

Square Root: 285.28757421240766

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

T(n,k) = Number of n X k 0..4 arrays with each element·equal to the number of its horizontal and vertical neighbors equal to 2,4,3,0,1 for x=0,1,2,3,4. A196786

Number of n X 4 0..4 arrays with each element·equal to the number its horizontal and vertical neighbors equal to 2,4,3,0,1 for x=0,1,2,3,4. A196782

Number of partitions satisfying cn(0,5) < cn(1,5) + cn(2,5) + cn(3,5) and cn(0,5) < cn(4,5) + cn(2,5) + cn(3,5). A39847

Numbers whose base-5 representation has exactly 8 runs. A43608

Number of non-unitary prime divisors of Catalan numbers, i.e., number of those prime factors whose exponent is greater than one. A81389