Properties of the Number 18525

Eighteen Thousand Five Hundred Twenty-Five

Basics

Value: 18524 → 18525 → 18526

Parity: odd

Prime: No

Previous Prime: 18523

Next Prime: 18539

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 ² × 13 × 19

Divisors: 1, 3, 5, 13, 15, 19, 25, 39, 57, 65

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100001011101

Octal: 44135

Duodecimal: A879

Hexadecimal: 485d

Square: 343175625

Square Root: 136.10657588816198

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

9-gonal (or enneagonal) pyramidal numbers: a(n) = n*(n+1)*(7·n-4)/6. A7584

a(n) = A069359(A276086(n)), where A276086 is the primorial base exp-function and A069359(n) = n * ∑_p∣n 1/p. A329029

Denominators of convergents to π by Farey fractions. A63673

Number of ways to partition the set of vertices of a convex {n+8}-gon into 3 non-intersecting polygons. A350116

Number of permutations of n distinct letters (ABCD...) each of which appears 5 times and having n-2 fixed points. A123296

Glaisher's function G(n) (18 squares version). A2609

a(n) = A069359(A276076(n)). A351951

Glaisher's function J(n) (18 squares version). A2613

Take pairs (a, b), sorted on a, such that T(a)+T(b)=concatenation of a and b, where T(k) is the k-th triangular number A000217(k). Sequence gives values of a. A96031

Numbers k such that 2·k-1, 4·k-1, 6·k-1 and 8·k-1 are primes. A124487