Properties of the Number 18565

Eighteen Thousand Five Hundred Sixty-Five

Basics

Value: 18564 → 18565 → 18566

Parity: odd

Prime: No

Previous Prime: 18553

Next Prime: 18583

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 5 × 47 × 79

Divisors: 1, 5, 47, 79, 235, 395, 3713, 18565

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100010000101

Octal: 44205

Duodecimal: A8B1

Hexadecimal: 4885

Square: 344659225

Square Root: 136.25344032353826

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 partitions of n into prime power parts (1 included); number of nonisomorphic Abelian subgroups of symmetric group S_n. A23893

Odd octagonal numbers: (2n+1)*(6n+1). A14641

Expansion of 1/((1-x)⁶ - x⁶). A192080

Expansion of 1/((1-x)*(1-3·x)*(1-4·x)). A16208

Number of partitions of n having population standard deviation < 2. A238658

Expansion of bracket function. A6090

a(n) = ∑_{k=0..floor(n/6)} binomial(n,6·k). A306847

Take n points in general position in the plane; draw all the (infinite) straight lines joining them; sequence gives number of connected regions formed. A55503

Octagonal numbers (A000567) in which parity of digits alternates. A297647

a(n) is the number of edges formed by n-secting the angles of a pentagon. A335555