Properties of the Number 19091

Nineteen Thousand Ninety-One

Basics

Value: 19090 → 19091 → 19092

Parity: odd

Prime: No

Previous Prime: 19087

Next Prime: 19121

Digit Sum: 20

Digital Root: 2

Palindrome: Yes

Factorization: 17 × 1123

Divisors: 1, 17, 1123, 19091

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100101010010011

Octal: 45223

Duodecimal: B06B

Hexadecimal: 4a93

Square: 364466281

Square Root: 138.17018491700733

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

E.g.f: exp(x/(1-2·x))/(1-2·x). A25167

Palindromic cyclops numbers. A138131

Palindromes of length greater than 1 in decimal expansion of π (not showing leading 0's). A68046

Number of partitions p of n such that (number of even numbers in p) >= (number of odd numbers in p). A241639

Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = ∑_j=0..n k^j * j! * binomial(n,j)². A341014

Consider all (2n+1)-digit palindromic primes of the form 90...0M0...09 (so that M is a palindrome with <= 2n-1 digits); a(n) = smallest such M. A100957

Numbers n such that n +/- the product of digits of n are both palindromes. A244541

p(1,n), where the polynomial p(n,x) is defined in Comments; sum of the numbers in row n of the triangular array at A249130. A249131

Numbers n for which there are exactly ten k such that n = k + reverse(k). A72434

Members of A038512 of the form k, k+2, k+6, k+8. A155511