Properties of the Number 81308

Eighty-One Thousand Three Hundred Eight

Basics

Value: 81307 → 81308 → 81309

Parity: even

Prime: No

Previous Prime: 81307

Next Prime: 81331

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 20327

Divisors: 1, 2, 4, 20327, 40654, 81308

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10011110110011100

Octal: 236634

Duodecimal: 3B078

Hexadecimal: 13d9c

Square: 6610990864

Square Root: 285.14557685505133

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+2)X(k+2) binary arrays avoiding patterns 001 and 010 in rows, columns and nw-to-se diagonals. A202898

a(n) = ∑_k=1..n-1 k·A110971(n,k). A152086

Number of (n+2)X5 binary arrays avoiding patterns 001 and 010 in rows, columns and nw-to-se diagonals. A202893

Number of (n+2)X6 binary arrays avoiding patterns 001 and 010 in rows, columns and nw-to-se diagonals. A202894

Expansion of e.g.f. 1 / (1 + log(1 - 3·x))^2/3. A367425

Number of ways to place 6 nonattacking queens on an n X n board. A176186

Number of ways to write n as sum of a prime and an 3-smooth number. A81308