Properties of the Number 81487

Eighty-One Thousand Four Hundred Eighty-Seven

Basics

Value: 81486 → 81487 → 81488

Parity: odd

Prime: No

Previous Prime: 81463

Next Prime: 81509

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 7 ² × 1663

Divisors: 1, 7, 49, 1663, 11641, 81487

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111001001111

Octal: 237117

Duodecimal: 3B1A7

Hexadecimal: 13e4f

Square: 6640131169

Square Root: 285.45927905745157

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

a(n) = n³ + (n+1)*(n+2). A270109

Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-2. A211958

Integers n such that 8·10ⁿ+21 is prime. A111022

E.g.f. A(x) satisfies: A(x) = cos(x/A(x)) + sin(x/A(x)). A195135

Sum of n-th row of triangle in A081485. A81487