Properties of the Number -9181

One Hundred Eighty-One

Basics

Value: -9182 → -9181 → -9180

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 9181

Divisors: 1, 9181

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10001111011101

Octal: -21735

Duodecimal: -5391

Hexadecimal: -23dd

Square: 84290761

Square Root: 95.81753492967766

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

a(1) = 1; a(n) = -∑_k=2..n k³ * a(floor(n/k)). A360658

Primes with first digit 9. A45715

Primes of the form k(k+1)/2+1 (i.e., central polygonal numbers, or one more than triangular numbers). A55469

a(n) = (9·n² + 3·n + 2)/2. A38764

Fundamental discriminants of real quadratic number fields with class number 5. A94614

Primes p such that (p+1)/2 and (p+2)/3 are also primes. A36570

Mother primes of order 8. A136067

Primes having only {1, 8, 9} as digits. A385783

Primes that are palindromic in base 9. A29977

a(n) is the greatest prime factor of a(n-1)²+a(n-1)+1. A56650