Properties of the Number 81930

Eighty-One Thousand Nine Hundred Thirty

Basics

Value: 81929 → 81930 → 81931

Parity: even

Prime: No

Previous Prime: 81929

Next Prime: 81931

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 × 2731

Divisors: 1, 2, 3, 5, 6, 10, 15, 30, 2731, 5462

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100000000001010

Octal: 240012

Duodecimal: 3B4B6

Hexadecimal: 1400a

Square: 6712524900

Square Root: 286.2341698679597

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 j such that j and 2j are both between a pair of twin primes. A66388

Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,51. A64262

Expansion of e.g.f. f(x)³ * log(f(x)), where f(x) = 1/(1 - 5·x)^1/5. A383233

a(n) is a non-palindromic composite located between twin primes whose reverse, which is less than it, is also located between twin primes. A103741

Averages of twin prime pairs of the form : sum of two or more consecutive squares. A174716

Numbers m such that exactly four subsets of {m-1, m, m+1} sum up to a prime number. A221310

Expansion of x(1-2x+3x²)/(1-x-2x)²;. A99431

Triangle read by rows in which row n gives n smallest palindromic numbers of n digits each. A81930