Properties of the Number 61800

Sixty-One Thousand Eight Hundred

Basics

Value: 61799 → 61800 → 61801

Parity: even

Prime: No

Previous Prime: 61781

Next Prime: 61813

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ³ × 3 × 5 ² × 103

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111000101101000

Octal: 170550

Duodecimal: 2B920

Hexadecimal: f168

Square: 3819240000

Square Root: 248.59605789312107

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

Consider sequence of fractions A066657/A066658 produced by ratios of terms in A066720; let m = smallest integer such that all fractions 1/n, 2/n, ..., (n-1)/n have appeared when we reach A066720(m) = k; sequence gives values of k; set a(n) = -1 if some fraction i/n never appears. A66848

a(0)=1; a(n) = sigma₁(n) + sigma₃(n). A92345

a(n) is the Wiener index of a broom on 2n vertices of which n+2 are pendant. A349416

a(n) = n + (-1)^{n mod 3}. A61800

A hexagonal spiral Fibonacci sequence. A94926

Number of nX4 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero. A230827