Properties of the Number -80581

Eighty Thousand Five Hundred Eighty-One

Basics

Value: -80582 → -80581 → -80580

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 61 × 1321

Divisors: 1, 61, 1321, 80581

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10011101011000101

Octal: -235305

Duodecimal: -3A771

Hexadecimal: -13ac5

Square: 6493297561

Square Root: 283.86792703650053

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

Strong pseudoprimes to base 2. A1262

Overpseudoprimes to base 2: composite k such that k = A137576((k-1)/2). A141232

Composite numbers k congruent to 5 (mod 8) such that 2^(k-1/2) mod k = k-1. A244626

Euler-Jacobi pseudoprimes: 2^(n-1/2) == (2 / n) mod n, where (2 / n) is a Jacobi symbol. A47713

Super-Poulet numbers: Poulet numbers whose divisors d all satisfy d∣2^d-2. A50217

Fermat pseudoprimes to base 2 with two prime factors. A214305

Strong pseudoprimes to base 4. A20230

Strong pseudoprimes to base 8. A20234

Composite numbers k == 1 (mod 4) such that (1 + i)^k == 1 + i (mod k), where i = sqrt(-1). A270698

a(n) = (lcm_k=0..n (2^k + 1))/(lcm_k=0..n-1 (2^k + 1)). A66845