Properties of the Number 99644

Ninety-Nine Thousand Six Hundred Forty-Four

Basics

Value: 99643 → 99644 → 99645

Parity: even

Prime: No

Previous Prime: 99643

Next Prime: 99661

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 29 × 859

Divisors: 1, 2, 4, 29, 58, 116, 859, 1718, 3436, 24911

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 11000010100111100

Octal: 302474

Duodecimal: 497B8

Hexadecimal: 1853c

Square: 9928926736

Square Root: 315.6643787315889

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

Even composite integers m such that U(m)² == 1 (mod m) and V(m) == 3 (mod m), where U(m)=A001906(m) and V(m)=A005248(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=3 and b=1, respectively. A337777

Numbers k such that k divides the (k+1)st Lucas number. A94397

Even composites in A145832 with at least three distinct prime factors. A145916

a(n) = floor( exp(19/21)*n! ). A30841

Suppose you take the ten digits 0..9, arrange them in any order and then either concatenate adjacent ones or separate them with a plus or minus sign, e.g., 98-76+5-4-32+10 or 9-8-765+3041-2. The first expression totals to "1", the second example totals to "2275". This sequence lists the positive integers that cannot be expressed in this way. A108224

Pisano periods (or Pisano numbers): period of Fibonacci numbers mod n. A1175

a(n) = 2^2ⁿ. A1146

Number of zeros in fundamental period of Fibonacci numbers mod n. A1176

Class numbers h(-p) where p runs through the primes p == 3 (mod 4). A2143

Numbers·such that p = x² + 2y², with prime p = A033203(n). A2332