Properties of the Number 22131

Twenty-Two Thousand One Hundred Thirty-One

Basics

Value: 22130 → 22131 → 22132

Parity: odd

Prime: No

Previous Prime: 22129

Next Prime: 22133

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2459

Divisors: 1, 3, 9, 2459, 7377, 22131

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101011001110011

Octal: 53163

Duodecimal: 10983

Hexadecimal: 5673

Square: 489781161

Square Root: 148.76491521860925

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 3-connected nets with n edges. A2880

Pseudoprimes to base 5, written in base 5. A262102

A Collatz-Fibonacci mixture: a(1) = 1, a(2) = 2, a(n+2) = a(n+1)/2+a(n)/2 if a(n+1) and a(n) have the same parity, a(n+2) = a(n+1)+a(n) otherwise. A69202

a(n+1)-+a(n)=prime, a(n+1)*a(n)=Average of twin prime pairs, a(1)=3,a(2)=10. A154496

Number of triangular regions in an equilateral triangular "frame" of size n (see Comments in A328526 for definition). A333032

Number of permutations of the prime indices of n with no adjacent triples (..., x, y, z, ...) such that x <= y <= z. A344652

Number of permutations of the prime indices of n with at least one non-singleton run, or non-separations. A336107

Square array read by upwards antidiagonals: T(m,n) is the number of simple 3-connected triangulations of a closed region in the plane with m+3 given external edges and 3n+m internal edges, m>=0, n>=1. A210664

Number of compositions of n² with parts <= n, such that each element of [n] is used at least once. A332721

Expansion of g.f. A(x) satisfying A(x)³ = A( x·A(x)²/(1 - A(x)) ). A372531