Properties of the Number -18971

Eighteen Thousand Nine Hundred Seventy-One

Basics

Value: -18972 → -18971 → -18970

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 61 × 311

Divisors: 1, 61, 311, 18971

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100101000011011

Octal: -45033

Duodecimal: -AB8B

Hexadecimal: -4a1b

Square: 359898841

Square Root: 137.73525329413673

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

Centered tetrahedral numbers. A5894

24 'Reverse and Add' steps are needed to reach a palindrome. A65318

Lucas pseudoprimes. A217120

Numbers that reach the fixed point 89 under iteration of f(x) = reverse(x) - maxdigit(x). A97155

Partial sums of A026905; the convolution of the natural numbers with the partition function. A85360

Strong Lucas pseudoprimes. A217255

C(2·n+4,4)-C(2·n,4). A85474

Numbers k such that 8·R_k - 5 is prime, where R_k = 11...1 is the repunit (A002275) of length k. A99422

Expansion of 1/(1-x⁴-x⁵-x⁶-x⁷-x⁸-x⁹-x¹⁰-x¹¹-x¹²-x¹³). A17835

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 25 ones. A31793