Properties of the Number 99999

Ninety-Nine Thousand Nine Hundred Ninety-Nine

Basics

Value: 99998 → 99999 → 100000

Parity: odd

Prime: No

Previous Prime: 99991

Next Prime: 100003

Digit Sum: 45

Digital Root: 9

Palindrome: Yes

Factorization: 3 ² × 41 × 271

Divisors: 1, 3, 9, 41, 123, 271, 369, 813, 2439, 11111

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000011010011111

Octal: 303237

Duodecimal: 49A53

Hexadecimal: 1869f

Square: 9999800001

Square Root: 316.226184874055

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

a(n) = 10ⁿ - 1. A2283

Repdigit numbers, or numbers whose digits are all equal. A10785

Smallest number whose sum of digits is n. A51885

Kaprekar numbers: positive numbers n such that n = q+r and n² = q·10^m+r, for some m >= 1, q >= 0 and 0 <= r < 10^m, with n ≠ 10^a, a >= 1. A6886

a(n)³ is smallest cube containing exactly n 9's. A48374

Smallest multiple of n using only digits 0 and 9. A78248

Largest number whose 4th power has n digits. A114322

The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive digits then we do not have d >= e > f, and S is always extended with the smallest integer not yet present in S. A239215

Largest number whose cube has n digits. A61439

Divisors of 9999999999. A27895