Properties of the Number 81011

Eighty-One Thousand Eleven

Basics

Value: 81010 → 81011 → 81012

Parity: odd

Prime: No

Previous Prime: 81001

Next Prime: 81013

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 7 × 71 × 163

Divisors: 1, 7, 71, 163, 497, 1141, 11573, 81011

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: 10011110001110011

Octal: 236163

Duodecimal: 3AA6B

Hexadecimal: 13c73

Square: 6562782121

Square Root: 284.6243137892475

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

Somos's sequence {a(6,n)} defined in comment in A018896: a(0)=a(1)= ... = a(13) = 1; for n>=14, a(n) = (a(n-1)*a(n-13) + a(n-7)²)/a(n-14). A271831

Group the natural numbers such that the n-th group sum is divisible by prime(n): (1, 2, 3), (4, 5), (6, 7, 8, 9), (10, 11), (12, 13, 14, 15, 16, 17, 18, 19, 20, 21), ... Sequence contains the sum of the terms in the n-th group. A86491

Integers n such that n+2!, n+2!+3!, n+2!+3!+4!, n+2!+3!+4!+5!, n+2!+3!+4!+5!+6!, and n+2!+3!+4!+5!+6!+7! are all prime. A267123

a(n) = Fibonacci(4n+3) + 2, or Fibonacci(2n+3)*Lucas(2n). A81011