Properties of the Number 81466

Eighty-One Thousand Four Hundred Sixty-Six

Basics

Value: 81465 → 81466 → 81467

Parity: even

Prime: No

Previous Prime: 81463

Next Prime: 81509

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 7 × 11 × 23 ²

Divisors: 1, 2, 7, 11, 14, 22, 23, 46, 77, 154

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111000111010

Octal: 237072

Duodecimal: 3B18A

Hexadecimal: 13e3a

Square: 6636709156

Square Root: 285.4224938577897

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 reversible strings with n-1 beads of 2 colors. 4 beads are black. String is not palindromic. A32091

a(n) = (n+1)*(n+2)*(n+3)*(9n+4)/24. A51798

Number of 3-cycles in the n X n rook graph. A288961

Number of n-element subsets of [n+4] having an even sum. A282080

Larger members of primitive φ-amicable pairs. A121249

Numbers k that divide the k-th Domb number. A372941

Consider the mapping f(a/b) = (a²+b²)/(a²-b²) from rationals to rationals. Starting with 2/1 (a=2, b=1) and applying the mapping to each new (reduced) rational number gives 2/1, 5/3, 17/8, 353/225, ... Sequence gives values of the denominators. A81466