Properties of the Number 99991

Ninety-Nine Thousand Nine Hundred Ninety-One

Basics

Value: 99990 → 99991 → 99992

Parity: odd

Prime: Yes

Previous Prime: 99989

Next Prime: 100003

Digit Sum: 37

Digital Root: 1

Palindrome: No

Factorization: 99991

Divisors: 1, 99991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000011010010111

Octal: 303227

Duodecimal: 49A47

Hexadecimal: 18697

Square: 9998200081

Square Root: 316.21353544717215

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

Largest n-digit prime. A3618

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

Number of Young tableaux of height <= 5. A49401

Primes that contain digits 1 and 9 only. A20457

Smallest prime beginning with exactly n 9's. A65592

a(n) = largest member of the n-th term in S(10) (defined in Comments). A158579

Primes of the form 90·R_k + 1, where R_k is the repunit (A002275) of length k. A93177

Near-repdigit primes with 9 as repeated digit. A105975

Greatest n-digit prime having at least n-1 identical digits. A241206

Near-repdigit primes with at least two 9's as the repeated digit, and ending in a distinct digit. A365598