Properties of the Number 28171

Twenty-Eight Thousand One Hundred Seventy-One

Basics

Value: 28170 → 28171 → 28172

Parity: odd

Prime: No

Previous Prime: 28163

Next Prime: 28181

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 11 × 13 × 197

Divisors: 1, 11, 13, 143, 197, 2167, 2561, 28171

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111000001011

Octal: 67013

Duodecimal: 14377

Hexadecimal: 6e0b

Square: 793605241

Square Root: 167.84218778364396

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) = (n+1)*(n+2)*(n+3)*(n+4)*(5·n² + 19·n + 15)/360. A107963

Numbers m with C(2·m, m) - prime(m) prime, where C(2·m, m) = (2·m)!/(m!)². A236248

Positions of squares in A259934. A263276

a(n+1) = a(n)-th composite and a(1) = 13. A59408

Composites in base 10 that remain composite in exactly four bases b, 2 <= b <= 10, expansions interpreted as decimal numbers. A256354

Expansion of ∏_k>=0 1/(1-x^4·k+1)³. A261632

Triangle T(n,k) defined by ∑_k=1..n T(n,k)*u^k*xⁿ/n! = exp(∑_n>0 u*σ(n)*xⁿ/n!). A338871

a(n) = ∑_k=1..n binomial(n,k) * σ(k) * σ(n - k + 1), where σ = A000203. A330088

Number of 3 X n 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing. A223950

Consider the array T(n, m) where the n-th row is the sequence of integer coefficients of A(x), where 1<=a(n)<=n, such that A(x)^1/n consists entirely of integer coefficients and where m is the (m+1)-th coefficient. This is the row sum of A to the first coefficient of one. A112285