Properties of the Number 22185

Twenty-Two Thousand One Hundred Eighty-Five

Basics

Value: 22184 → 22185 → 22186

Parity: odd

Prime: No

Previous Prime: 22171

Next Prime: 22189

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 17 × 29

Divisors: 1, 3, 5, 9, 15, 17, 29, 45, 51, 85

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101011010101001

Octal: 53251

Duodecimal: 10A09

Hexadecimal: 56a9

Square: 492174225

Square Root: 148.94629904767692

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

Numbers k such that 2·k+1, 4·k+1, 8·k+1 and 16·k+1 are primes. A124412

a(n)*a(n-11) = a(n-1)*a(n-10)+a(n-5)+a(n-6) with initial terms a(1)=...=a(11)=1. A133848

Number of compositions (ordered partitions) of n into distinct parts >= 4. A339102

a(0)=1, a(1)=1, a(n) = 9·a(n/2) for even n >= 2, and a(n) = 8·a((n-1)/2) + a((n+1)/2) for odd n >= 3. A116526

9 times octagonal numbers: a(n) = 9·n*(3·n-2). A64201

Numbers k such that 2·k+1, 4·k+1, 8·k+1, 16·k+1 and 32·k+1 are primes. A124413

Numbers m such that m·reversal(m) contains every decimal digit exactly once. A178929

Number of partitions of n with difference -3 between the number of odd parts and the number of even parts, both counted without multiplicity. A242689

29-gonal pyramidal numbers: a(n) = n*(n+1)*(9·n-8)/2. A256649

Numbers n such that the Diophantine equation x⁴+y⁵=n⁴ has solutions. A70756