Properties of the Number 11561

Eleven Thousand Five Hundred Sixty-One

Basics

Value: 11560 → 11561 → 11562

Parity: odd

Prime: No

Previous Prime: 11551

Next Prime: 11579

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 11 × 1051

Divisors: 1, 11, 1051, 11561

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110100101001

Octal: 26451

Duodecimal: 6835

Hexadecimal: 2d29

Square: 133656721

Square Root: 107.5220907534819

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

Expansion of (1/(1-x²))*∏_m>=0 1/(1-x^2m+1). A38348

a(n) = 10·n² + 1. A158187

Nonprime numbers with all divisors starting and ending with digit 1. A208261

Number of walks of length n between two nodes at distance 2 in the cycle graph C₇. A95307

a(n) = 40·n² + 1. A158602

Number of (w,x,y) with all terms in {0,...,n} and |w-x| + |x-y| ≠ w+x+y. A213480

Values of A098550 where A098550(k)/k reaches a record high. A251415

a(n) = ∑_{k=0..floor(n/7)} binomial(n,7·k). A306852

Composite numbers k with its divisors having the property that the last digit of every divisor is the same as the first digit of the next divisor. A307858

a(n) = ∑_k=0..n binomial(2·n,7·k). A387845