Properties of the Number 81188

Eighty-One Thousand One Hundred Eighty-Eight

Basics

Value: 81187 → 81188 → 81189

Parity: even

Prime: No

Previous Prime: 81181

Next Prime: 81197

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 20297

Divisors: 1, 2, 4, 20297, 40594, 81188

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110100100100

Octal: 236444

Duodecimal: 3AB98

Hexadecimal: 13d24

Square: 6591491344

Square Root: 284.93508032532606

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

Given the infinite continued fraction i+(i/(i+(i/(i+...)))), where i is the square root of (-1), this is the numerator of the imaginary part of the convergents. A91808

Expansion of x/(x⁴-x³-2x²-x+1). A92886

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-2)*b(n-1)*b(n), where a(0) = 3, a(1) = 4, b(0) = 1, b(1) = 2, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences. A296283

Number of (n+4) X 7 0..1 matrices with each 5 X 5 subblock idempotent. A224685

Number of graph minors in the cycle graph C_n. A353206

a(n+1) is the Hankel transform of C(n)+C(n+2), where C(n) = A000108(n). A138269

6th binomial transform of (1,0,1,0,1,.....), A059841. A81188