Properties of the Number 19145

Nineteen Thousand One Hundred Forty-Five

Basics

Value: 19144 → 19145 → 19146

Parity: odd

Prime: No

Previous Prime: 19141

Next Prime: 19157

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 7 × 547

Divisors: 1, 5, 7, 35, 547, 2735, 3829, 19145

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101011001001

Octal: 45311

Duodecimal: B0B5

Hexadecimal: 4ac9

Square: 366531025

Square Root: 138.3654581172628

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 N = k⁶ is a twin rank (cf. A002822: 6N +- 1 are twin primes). A326236

Hard numbers: a(n) = smallest positive number m with f(m) = n, where f(m) is the smallest number of digits that are needed to construct m using only 1's, 2's and any number of +, -, *, ^ signs, allowing concatenation of the digits. A60273

Sum of first n 6-almost primes. A86052

a(n) = floor( n*(n-1)*(n-2)*(n-3)/22 ). A11932

Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-1,2}. A79990

Consider the family of multigraphs enriched by the species of partitions. Sequence gives the triangle read by rows giving coefficients of polynomials arising from enumeration of those multigraphs on n edges. A98315

G.f.: 1/((1-t¹⁰)*(1-t)*(1-t³)*(1-t⁵)*(1-t⁷)*(1-t⁹)*(1-t¹¹)*(1-t¹³)*(1-t¹⁵)*(1-t¹⁷)*(1-t¹⁹)). A266750

Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MEI = ZSM-18 Nan[AlnSi34-nO68].28H2O (n=2.1-5.7) starting with a T1 atom. A19145