Properties of the Number 18259

Eighteen Thousand Two Hundred Fifty-Nine

Basics

Value: 18258 → 18259 → 18260

Parity: odd

Prime: No

Previous Prime: 18257

Next Prime: 18269

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 19 × 31 ²

Divisors: 1, 19, 31, 589, 961, 18259

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011101010011

Octal: 43523

Duodecimal: A697

Hexadecimal: 4753

Square: 333391081

Square Root: 135.1258672497609

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

Number of log-concave compositions (ordered partitions) of n. A69916

a(n) = n*(8·n² - 5)/3. A63523

a(n) = 19·n². A244631

Numbers whose square starts with 4 identical digits. A132391

Ulam's spiral (ESE spoke). A143855

Number of partitions p of n such that (number of numbers in p of form 3k) > (number of numbers in p of form 3k+1). A241745

Maximal non-semiprime number which is a "preprime" of the n-th kind (defined in comment in A247395). A247834

Numbers p²*q, p > q odd primes such that q does not divide p-1, and q does not divide p+1. A350421

Numbers k such that 4k+1 is a palindromic prime. A192261

a(n) = 3·a(n-1) - 3·a(n-2) + 2·a(n-3) - 2·a(n-4) + a(n-5) for n >= 10, a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 12, a(4) = 20, a(5) = 32, a(6) = 50, a(7) = 77, a(8) = 116, a(9) = 174. A289115