Properties of the Number 18491

Eighteen Thousand Four Hundred Ninety-One

Basics

Value: 18490 → 18491 → 18492

Parity: odd

Prime: No

Previous Prime: 18481

Next Prime: 18493

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 11 × 41 ²

Divisors: 1, 11, 41, 451, 1681, 18491

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100100000111011

Octal: 44073

Duodecimal: A84B

Hexadecimal: 483b

Square: 341917081

Square Root: 135.98161640457138

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

a(n) = ∑_d∣n p(d), where p(d) = A000041 = number of partitions of d. A47968

Number of parts that are visible in one of the three views of the section model of partitions version "tree" with n sections. A194805

Number of odd-length integer partitions of n whose parts do not have the same mean as median. A359896

T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero. A298328

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

Composite numbers whose prime factors contain no digits other than 1 and 4. A36304

Number of nonnegative integer arrays of length 2n+5 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value n+1. A211850

Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero. A298323

Composite numbers that contain only nonprime digits and whose prime factors contain only nonprime digits. A383934

Numbers k such that σ(k) = ψ(k) + 2 * τ(k). A387962