Properties of the Number 65821

Sixty-Five Thousand Eight Hundred Twenty-One

Basics

Value: 65820 → 65821 → 65822

Parity: odd

Prime: No

Previous Prime: 65809

Next Prime: 65827

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 7 × 9403

Divisors: 1, 7, 9403, 65821

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10000000100011101

Octal: 200435

Duodecimal: 32111

Hexadecimal: 1011d

Square: 4332404041

Square Root: 256.55603676390075

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

Numbers k which have a factorization k = f1·f2*...*fr where the digits of {k, f1, f2, ..., fr} together give 0,1,...,9 exactly once. A370970

Table T(n,k) giving number of ways of obtaining exactly one correct answer on an (n,k)-matching problem (1 <= k <= n). A76732

Expansion of c(6·x²)/(1-x·c(6·x²)), where c(x) is the g.f. of A000108. A132373

Number of 7-ary words either empty or beginning with the first character of the alphabet, that can be built by inserting n doublets into the initially empty word. A194727

Numbers k which use half of the ten digits such that they have at least one factorization k=p·q that uses remaining half of the digits that are not in k. A195814

List of base-ten k-balanced factorization integers: The combined digits of an integer and its factorization primes and exponents contain exactly k copies of each of the ten digits, for some k. A273260

Convolution of Fibonacci numbers and A000201. A23611

Numbers that together with their prime factors contain every digit exactly once. A124668

Number of n-ary words beginning with the first character of the alphabet, that can be built by inserting five doublets into the initially empty word. A194717

Numbers n such that digits of n and the prime factorization of n are distinct and nonrepeating. A57885