Properties of the Number 81606

Eighty-One Thousand Six Hundred Six

Basics

Value: 81605 → 81606 → 81607

Parity: even

Prime: No

Previous Prime: 81569

Next Prime: 81611

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 7 × 29 × 67

Divisors: 1, 2, 3, 6, 7, 14, 21, 29, 42, 58

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111011000110

Octal: 237306

Duodecimal: 3B286

Hexadecimal: 13ec6

Square: 6659539236

Square Root: 285.667639049298

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

Number of ways to place 4n nonattacking kings on an 8 X 2n cylindrical chessboard. A194646

Triangle read by rows: T(n,r), 0 <= r <= n, is the number of idempotents of rank r in the twisted planar partition monoid PP_n^τ. A289620

Number of ways to place 6n nonattacking kings on a vertical cylinder 12 X 2n. A195594

Expansion of ∏_k>=0 (1 + x^4·k+3)^4·k+3. A285339

Numbers k such that 8·10^k + 5·R_k + 2 is prime, where R_k = 11...1 is the repunit (A002275) of length k. A103085

Number of nondecreasing arrangements of 5 nonzero numbers in -(n+3)..(n+3) with sum zero. A188335

Numbers having at least one 1 in their ternary representation. A81606