Properties of the Number 16521

Sixteen Thousand Five Hundred Twenty-One

Basics

Value: 16520 → 16521 → 16522

Parity: odd

Prime: No

Previous Prime: 16519

Next Prime: 16529

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 5507

Divisors: 1, 3, 5507, 16521

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100000010001001

Octal: 40211

Duodecimal: 9689

Hexadecimal: 4089

Square: 272943441

Square Root: 128.53404218338423

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

T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero. A298582

a(n+1)-+a(n)=prime, a(n+1)*a(n)=Average of twin prime pairs, a(1)=3,a(2)=10. A154496

a(n) = ∑_k=3..n binomial(k-1,2) * floor(n/k). A366970

Triangle of coefficients of polynomials v(n,x) jointly generated with A209162; see the Formula section. A209163

Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 22 (most significant digit on right). A61951

If x² + 2·y² is prime for all positive integers·and y with m = x·y then m is in the sequence. A287799

Least k for which ω(6k-1) + ω(6k+1) >= n. A145194

Number of binary strings of length n with no substrings equal to 0001 0100 or 1101. A164467

Number of 0..n arrays x(0..7) of 8 elements with zero 5th differences. A200275

Years >= 1801 in which Christmas falls in Sukkot. A222419