Properties of the Number 5681

Five Thousand Six Hundred Eighty-One

Basics

Value: 5680 → 5681 → 5682

Parity: odd

Prime: No

Previous Prime: 5669

Next Prime: 5683

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 13 × 19 × 23

Divisors: 1, 13, 19, 23, 247, 299, 437, 5681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 1011000110001

Octal: 13061

Duodecimal: 3355

Hexadecimal: 1631

Square: 32273761

Square Root: 75.37240874484509

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

Squarefree integers m > 1 such that if prime p divides m, then the sum of the base p digits of m is at least p. A324315

Partial sums of floor(n²/8). A122046

Odd squarefree numbers n such that the cyclotomic polynomial φ(n,x) has height 4. A152942

Maximal number of squares of side 1 in a disk of radius n. A125228

a(n) = A225627(n)/A000793(n). A225636

Expansion of g.f. A(x) satisfying A(x) = 1 + x·A(x)/(1 - 4·x*A(x))². A365774

Alternating sum of hexagonal pyramidal numbers. A266677

Numbers m such that 18·m + 1, 36·m + 1, 108·m + 1, and 162·m + 1 are all primes. A372188

Principal diagonal of the convolution array A213783. A213759

Number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 147", based on the 5-celled von Neumann neighborhood. A270290