Properties of the Number 90019

Ninety Thousand Nineteen

Basics

Value: 90018 → 90019 → 90020

Parity: odd

Prime: Yes

Previous Prime: 90017

Next Prime: 90023

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 90019

Divisors: 1, 90019

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101111110100011

Octal: 257643

Duodecimal: 44117

Hexadecimal: 15fa3

Square: 8103420361

Square Root: 300.03166499554675

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

Primes having only {0, 1, 9} as digits. A199329

Primes starting and ending with 9. A62335

Emirps starting and ending with composite digit 9. A128374

Primes that are the concatenation of a square and a prime that is the concatenation of two squares. A364359

Primes p(x) satisfying the following conditions: (a) A082882(x)=1; (b) {p(x),p(x+1)} are not twin primes; (c) values of A075860(j) for j composites between these two non-twin primes are identical. A82883

Numbers n such that A = n - digitsum(n) is divisible by the largest power of 10 <= A. A242474

Wieferich primes: primes p such that p² divides 2^p-1 - 1. A1220

a(n) = n·a(n-1) + (n-1)*a(n-2), a(0) = 1, a(1) = 1. A255

Apéry numbers: n·C(2·n,n). A5430

Random walks (binomial transform of A006054). A5021