Properties of the Number 51821

Fifty-One Thousand Eight Hundred Twenty-One

Basics

Value: 51820 → 51821 → 51822

Parity: odd

Prime: No

Previous Prime: 51817

Next Prime: 51827

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 7 × 11 × 673

Divisors: 1, 7, 11, 77, 673, 4711, 7403, 51821

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1100101001101101

Octal: 145155

Duodecimal: 25BA5

Hexadecimal: ca6d

Square: 2685416041

Square Root: 227.64226321138173

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

Iccanobif numbers: add previous two terms and reverse the sum, starting with 0, 1. A14258

Triangle T read by rows: matrix product of Pascal and Catalan triangle. A104259

Binomial transform of [1, 7, 17, 17, 6, 0, 0, 0, ...]. A132117

Numbers n such that P(11·n) is prime where P(n) is the partition number. A113499

Consider a number x = concat(a,b). Sequence lists numbers·such that digits of b^a end in x. A266818

Inverse of Fibonacci convolution array A154929. A154930

Tumbling distance for n-input mappings with 2 steps. A5947

Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MFI = ZSM-5 Nan[AlnSi96-nO192] starting with a T5 atom. A19162

Riordan array (1, (1/(1-x))c(x/(1-x))), c(x) the g.f. of A000108. A155887

Number of active (ON, black) cells at stage 2ⁿ-1 of the two-dimensional cellular automaton defined by "Rule 825", based on the 5-celled von Neumann neighborhood. A273431