Properties of the Number 81489

Eighty-One Thousand Four Hundred Eighty-Nine

Basics

Value: 81488 → 81489 → 81490

Parity: odd

Prime: No

Previous Prime: 81463

Next Prime: 81509

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 3 × 23 × 1181

Divisors: 1, 3, 23, 69, 1181, 3543, 27163, 81489

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111001010001

Octal: 237121

Duodecimal: 3B1A9

Hexadecimal: 13e51

Square: 6640457121

Square Root: 285.46278216257895

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 parking functions of size n avoiding the patterns 132 and 321. A362595

Glaisher's function H'(4n+1) (18 squares version). A2610

a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2^p+1 + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^p+1, starting with a(1) = 1, a(2) = 2, and a(3) = 3. A49957

a(n) = n*(2·n² -3·n +7)/6 = C(n, 1) + C(n, 2) + 2·C(n, 3). A81489