Properties of the Number 15644

Fifteen Thousand Six Hundred Forty-Four

Basics

Value: 15643 → 15644 → 15645

Parity: even

Prime: No

Previous Prime: 15643

Next Prime: 15647

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 3911

Divisors: 1, 2, 4, 3911, 7822, 15644

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11110100011100

Octal: 36434

Duodecimal: 9078

Hexadecimal: 3d1c

Square: 244734736

Square Root: 125.07597691003656

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

Number of compositions of n whose run-lengths are all different. A329739

Number of unlabeled rooted trees with n nodes where the branches of no non-leaf branch of any terminal subtree form a submultiset of the branches of the same subtree. A324844

T(n,k)=Number of nXk 0..1 arrays with no element less than a strict majority of its horizontal, vertical and antidiagonal neighbors. A231544

Expansion of x*(1-x)/((1-2·x)*(1+3·x)). A91004

a(n) = a(n-1) + 6·a(n-2) for n >= 2, a(0)=1, a(1)=2. A133467

Numbers k such that (k+3, k+5, k+17, k+257, k+65537) are all primes. A63799

a(n) = n³ plus sum of digits of n³. A123135

Expansion of ∏_k>0 (1 - x^k)^{2^(k-1}) in powers of x. A200751

Dirichlet convolution of A276086 (primorial base exp-function) with A055615 (Dirichlet inverse of n). A383286

Number of nX3 0..1 arrays with no element less than a strict majority of its horizontal, vertical and antidiagonal neighbors. A231539