Properties of the Number 81309

Eighty-One Thousand Three Hundred Nine

Basics

Value: 81308 → 81309 → 81310

Parity: odd

Prime: No

Previous Prime: 81307

Next Prime: 81331

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 27103

Divisors: 1, 3, 27103, 81309

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10011110110011101

Octal: 236635

Duodecimal: 3B079

Hexadecimal: 13d9d

Square: 6611153481

Square Root: 285.147330339949

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. A(x) satisfies: -x³ = ∑_n=-oo..oo (-1)ⁿ * x^n*(n+1/2) * A(x)^n*(n-1/2). A354648

Smallest prime p such that n-p is a 3-smooth number, a(n)=0 if no such prime exists. A81309