Properties of the Number 99

Ninety-Nine

Basics

Value: 98 → 99 → 100

Parity: odd

Prime: No

Previous Prime: 97

Next Prime: 101

Digit Sum: 18

Digital Root: 9

Palindrome: Yes

Factorization: 3 ² × 11

Divisors: 1, 3, 9, 11, 33, 99

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100011

Octal: 143

Duodecimal: 83

Hexadecimal: 63

Square: 9801

Square Root: 9.9498743710662

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

The odd numbers: a(n) = 2·n + 1. A5408

Completely multiplicative with a(prime(k)) = prime(k+1). A3961

Palindromes in base 10. A2113

Numbers that are not squarefree. Numbers that are divisible by a square greater than 1. The complement of A005117. A13929

Pell-Lucas numbers: numerators of continued fraction convergents to sqrt(2). A1333

a(n) = n*(n+2) = (n+1)² - 1. A5563

a(n) = 3·n. A8585

Lucky numbers. A959

Evil numbers: nonnegative integers with an even number of 1's in their binary expansion. A1969

Numbers that are the product of exactly three (not necessarily distinct) primes. A14612

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