Properties of the Number 11521

Eleven Thousand Five Hundred Twenty-One

Basics

Value: 11520 → 11521 → 11522

Parity: odd

Prime: No

Previous Prime: 11519

Next Prime: 11527

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 41 × 281

Divisors: 1, 41, 281, 11521

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110100000001

Octal: 26401

Duodecimal: 6801

Hexadecimal: 2d01

Square: 132733441

Square Root: 107.33592129385204

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

Centered octahedral numbers (crystal ball sequence for cubic lattice). A1845

a(n) = C(n,1) + C(n,2) + C(n,3), or n*(n² + 5)/6. A4006

Positive numbers for which the sum of digits equals the product of digits. A34710

Values of n such that L(20) and N(20) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A227523

Pseudoprimes to base 7. A5938

16-gonal (or hexadecagonal) numbers: a(n) = n*(7·n-6). A51868

Array T read by diagonals, n-th difference of (T(k,n),T(k,n-1),...,T(k,0)) is (k+n)², for n=1,2,3,...; k=0,1,2,... A48505

a(n) = a(n-1) + ∑_{k=1..floor(n/4)} a(n-4k), with a(0)=1. A113439

Expansion of 1/(1-x*(1-8·x)). A145978

Nonprimes whose sum of digits is equal to its product of digits. A66307