Properties of the Number -81988

Eighty-One Thousand Nine Hundred Eighty-Eight

Basics

Value: -81989 → -81988 → -81987

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 103 × 199

Divisors: 1, 2, 4, 103, 199, 206, 398, 412, 796, 20497

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

7989 Try Today's Challenge

Representations

Binary: -10100000001000100

Octal: -240104

Duodecimal: -3B544

Hexadecimal: -14044

Square: 6722032144

Square Root: 286.33546759002803

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

Numerator of ∑_k=1..n μ(k)/k. A70888

a(n) = numerator of rational number Im(P(x))/π, for·in interval (1/A005117(n+1),1/A005117(n)), where P(x) is the prime ζ function. A385808

Numerator of ∑_k=1..n μ(k)/k when it changes sign. A70890