Properties of the Number 81488

Eighty-One Thousand Four Hundred Eighty-Eight

Basics

Value: 81487 → 81488 → 81489

Parity: even

Prime: No

Previous Prime: 81463

Next Prime: 81509

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 ⁴ × 11 × 463

Divisors: 1, 2, 4, 8, 11, 16, 22, 44, 88, 176

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011111001010000

Octal: 237120

Duodecimal: 3B1A8

Hexadecimal: 13e50

Square: 6640294144

Square Root: 285.4610306153889

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

G.f. satisfies: A(x) = 1/AGM(1, 1 - 8·x/A(x) ). A158100

G.f. satisfies: A(x²) = -4·x + 1/AGM(1, 1 - 8·x/(A(x²) + 4·x) ). A158101

The smallest k such that the number of steps in the n Collatz sequences starting at k+i, i=0..n-1, is always prime. A174538

Numbers k such that (19·10^k + 191)/3 is prime. A280632

(Sum of n-th row of triangle in A081485)/n. A81488