Properties of the Number 81969

Eighty-One Thousand Nine Hundred Sixty-Nine

Basics

Value: 81968 → 81969 → 81970

Parity: odd

Prime: No

Previous Prime: 81967

Next Prime: 81971

Digit Sum: 33

Digital Root: 6

Palindrome: No

Factorization: 3 × 89 × 307

Divisors: 1, 3, 89, 267, 307, 921, 27323, 81969

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100000000110001

Octal: 240061

Duodecimal: 3B529

Hexadecimal: 14031

Square: 6718916961

Square Root: 286.3022878008487

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

Numbers k such that k and k² use only the digits 1, 6, 7, 8 and 9. A137065

Expansion of x*(4+5·x-13·x²-x³+x⁴) / ( (1-x)*(1-10·x²+x⁴) ). A179934

Number of (n+3) X 5 0..2 matrices with each 4 X 4 subblock idempotent. A224722

Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the diagonal and antidiagonal minus the sum of the minimums of the central row and column nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A254261

Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the diagonal and antidiagonal minus the sum of the minimums of the central row and column nondecreasing horizontally and vertically. A254300

Number of (n+1)X(5+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0011 or 0111. A259247

Duplicate of A076097. A81969