Properties of the Number 65641

Sixty-Five Thousand Six Hundred Forty-One

Basics

Value: 65640 → 65641 → 65642

Parity: odd

Prime: No

Previous Prime: 65633

Next Prime: 65647

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 41 × 1601

Divisors: 1, 41, 1601, 65641

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000000001101001

Octal: 200151

Duodecimal: 31BA1

Hexadecimal: 10069

Square: 4308740881

Square Root: 256.20499604808646

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

Expansion of (1-x)*(1+x)/(1-2·x-x²+x³). A52534

Semiprimes of the form n³ + n² + n + 1. A237627

Let i be in {1,2,3}, let r >= 0 be an integer and n=2·r+i-1. Then a(n)=a(2·r+i-1) gives the quantity of H_7,2,0 tiles in a subdivided H_7,i,r tile after linear scaling by the factor x^r, where x=sqrt((2·cos(π/7))²-1). A187069

a(n) = (40ⁿ - 1)/39. A218743

Composite numbers k for which k - φ(k) divides k-1. A160599

The least common multiple of 1+n and 1+n². A281660

Numbers of the form k³+k²+k+1 that are the product of two distinct primes. A176070

Strong pseudoprimes to base 42. A20268

Numbers n such that sigma₃(n) is divisible by square of cototient of n, while n is not a prime number. A91286

Replace 3ⁱ with nⁱ in ternary representation of n. A193760