Properties of the Number 71181

Seventy-One Thousand One Hundred Eighty-One

Basics

Value: 71180 → 71181 → 71182

Parity: odd

Prime: No

Previous Prime: 71171

Next Prime: 71191

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 11 × 719

Divisors: 1, 3, 9, 11, 33, 99, 719, 2157, 6471, 7909

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001011000001101

Octal: 213015

Duodecimal: 35239

Hexadecimal: 1160d

Square: 5066734761

Square Root: 266.7976761517986

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

T(n,k) = Number of n X k 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. A284199

Number of n X 4 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. A284195

Number of n X 5 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. A284196

Start the sequence with a(1) = 3. From now on iterate: if |a(n)| is prime, subtract from a(n) the |a(n)|-th prime of the list of primes A000040 and if |a(n)| is nonprime, add to a(n) the |a(n)|-th nonprime of the list of nonprimes A018252. A374834

Number of numbers k such that φ(k) divides φ(n). A71181