Properties of the Number 81923

Eighty-One Thousand Nine Hundred Twenty-Three

Basics

Value: 81922 → 81923 → 81924

Parity: odd

Prime: No

Previous Prime: 81919

Next Prime: 81929

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 17 × 61 × 79

Divisors: 1, 17, 61, 79, 1037, 1343, 4819, 81923

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10100000000000011

Octal: 240003

Duodecimal: 3B4AB

Hexadecimal: 14003

Square: 6711377929

Square Root: 286.2219418563154

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

a(n) = n! * ∑_k=0..n A000296(k)/k!. A113059

a(n) = K₃(n) = ∑_k>=0 A090285(3,k)*2^k*binomial(n,k). a(n) = (4·n³+30·n²+56·n+15)/3. A90294

Numbers such that the sequence of all possible sums of divisors of n is increasing but not strictly so, the sums being ordered by their characteristic functions, seen as binary numbers (see example). A230492

Sum of all n-digit Cullen numbers. A131700

Number of nXnXn 0..6 triangular arrays with each element·equal to the number its neighbors equal to 3,1,3,1,0,0,0 for x=0,1,2,3,4,5,6. A198159

Expansion of e.g.f.: exp(2x)/(1-x)². A81923