Properties of the Number 81228

Eighty-One Thousand Two Hundred Twenty-Eight

Basics

Value: 81227 → 81228 → 81229

Parity: even

Prime: No

Previous Prime: 81223

Next Prime: 81233

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 7 × 967

Divisors: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011110101001100

Octal: 236514

Duodecimal: 3B010

Hexadecimal: 13d4c

Square: 6597987984

Square Root: 285.0052631092977

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 read by rows: T(n,k) is number of labeled bipartite graphs with n nodes and k edges. A117279

Number of bipartite graphs with 5 edges on nodes {1..n}. A53528

Expansion of 1/((1-x)(1-4x)(1-5x)(1-6x)). A21744

Sum(j=1,n,floor(A000041(j)/j)). A86736

Partial sums of A081227. A81228

Number of (4+1)X(n+1) 0..2 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction. A250998