Properties of the Number -81638

Eighty-One Thousand Six Hundred Thirty-Eight

Basics

Value: -81639 → -81638 → -81637

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 × 40819

Divisors: 1, 2, 40819, 81638

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8109 Try Today's Challenge

Representations

Binary: -10011111011100110

Octal: -237346

Duodecimal: -3B2B2

Hexadecimal: -13ee6

Square: 6664763044

Square Root: 285.72364270392467

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

Triangle read by rows: T(n,k) = ((Stirling2)²)(n,k) * k! A233357

E.g.f.: (exp(exp(x)-1)-1)². A52896

D'Agapeyeff cipher. A135209