Properties of the Number 81869

Eighty-One Thousand Eight Hundred Sixty-Nine

Basics

Value: 81868 → 81869 → 81870

Parity: odd

Prime: Yes

Previous Prime: 81853

Next Prime: 81883

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 81869

Divisors: 1, 81869

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111111001101

Octal: 237715

Duodecimal: 3B465

Hexadecimal: 13fcd

Square: 6702533161

Square Root: 286.12759391572143

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

Eigensequence for the Moebius μ triangle A152904. A185694

Cube root of A030697. A30698

A104449(n+1)+prime(n), sum of a Lucas and the prime sequence. A160244

a(1) = 1, a(2) = 2. For n > 2, a(n) is the least novel power of the greatest prime divisor of a(n-2) + a(n-1). A359874

Initial member of 6 consecutive primes a, b, c, d, e, f such that both (f + a)/(d - c) and (e + b)/(d - c) are prime. A293619

Full autoinsertable of reversed multidigit primes are such primes that remain prime after all the possible internal autoinsertions of the reversed prime, one at a time. A335314

a(1)=2; for n>1, a(n)=2·a(n-1)-1 if that number is composite, a(n)=a(n-1)+1 otherwise. A81869