Properties of the Number 18261

Eighteen Thousand Two Hundred Sixty-One

Basics

Value: 18260 → 18261 → 18262

Parity: odd

Prime: No

Previous Prime: 18257

Next Prime: 18269

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2029

Divisors: 1, 3, 9, 2029, 6087, 18261

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011101010101

Octal: 43525

Duodecimal: A699

Hexadecimal: 4755

Square: 333464121

Square Root: 135.1332675546625

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

Partial sums of A299254. A299260

Riordan array (1/sqrt(1-2·x-3·x²), M(x)-1) where M(x) is the g.f. of the Motzkin numbers A001006. A114422

Numbers k such that the decimal digits of φ(k) are a permutation of those of k. A115921

MacMahon's generalized sum of divisors function. A2128

Number of walks of length n between adjacent nodes on the Petersen graph. A91001

Number of partitions p of n such that neither floor(mean(p)) nor ceiling(mean(p)) is a part. A241343

Maximal elements of pairs of "Super Unitary Amicable Numbers", sorted by their minimal elements. A45614

Number of quadrilateral regions in an equilateral triangular "frame" of size n (see Comments in A328526 for definition). A333033

a(n) = A013928(A002110(n)). A158341

Row sums of A259701 except first column. A259702