Properties of the Number 42181

Forty-Two Thousand One Hundred Eighty-One

Basics

Value: 42180 → 42181 → 42182

Parity: odd

Prime: Yes

Previous Prime: 42179

Next Prime: 42187

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 42181

Divisors: 1, 42181

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1010010011000101

Octal: 122305

Duodecimal: 204B1

Hexadecimal: a4c5

Square: 1779236761

Square Root: 205.38013535880242

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

Initial term in sequence of four consecutive primes separated by 3 consecutive differences each <=6 (i.e., when d = 2, 4 or 6) and forming d-pattern = [6, 6, 4]; short d-string notation of pattern = [664]. A78858

Concatenate n with n-th prime. A45532

Primes which are a concatenation of n and prime(n). A84667

Primes p2 such that p1³ + p2² is an average of twin primes and p1 < p2 are consecutive primes. A138755

Number of (w,x,y) with all terms in {0,...,n} and max(w,x,y) >= 2·min(w,x,y). A213390

Indices where A092243 strictly changes sign. A269737

Lesser member p of sexy primes (p, p+6) such that (p+1, p+2, p+3, p+4, p+5) all have the same number of prime divisors (counted with multiplicity). A94231

Smallest prime such that n·k(n)²+n·k(n)+1 is a prime > (n-1)*k(n-1)²+(n-1)*k(n-1)+1 with k(n)>1 or 0 if n=4 as no prime possible. A104995

Greater of twin primes p2 such that p1³+p2²=pp is the average of twin primes. p1 and p2 twin primes, p1 < p2. A139779

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 625", based on the 5-celled von Neumann neighborhood. A273272