Properties of the Number 91009

Ninety-One Thousand Nine

Basics

Value: 91008 → 91009 → 91010

Parity: odd

Prime: Yes

Previous Prime: 90997

Next Prime: 91019

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 91009

Divisors: 1, 91009

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110001110000001

Octal: 261601

Duodecimal: 44801

Hexadecimal: 16381

Square: 8282638081

Square Root: 301.6769795658926

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

Value of prime number D for incrementally largest values of minimal·satisfying the equation x² - D·y² = -5. A341083

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 such that p + q +- 1 and p³ + q³ +- 1 are twin prime pairs, where q = nextprime(p). A366644

Number of triples (u,v,w) of divisors of n with v-u = w-v, and u < v < w. A91009

a(n) is the smallest n-digit prime which remains prime whenever a 9 is inserted, appended or prepended, or 0 if no such prime exists. A228150