Properties of the Number 81988

Eighty-One Thousand Nine Hundred Eighty-Eight

Basics

Value: 81987 → 81988 → 81989

Parity: even

Prime: No

Previous Prime: 81973

Next Prime: 82003

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

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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

Product of digits + 1 is a prime. A81988