Properties of the Number -8911

Nine Hundred Eleven

Basics

Value: -8912 → -8911 → -8910

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 7 × 19 × 67

Divisors: 1, 7, 19, 67, 133, 469, 1273, 8911

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10001011001111

Octal: -21317

Duodecimal: -51A7

Hexadecimal: -22cf

Square: 79405921

Square Root: 94.39809320108114

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

Triangle: p(x) = (1 - t/c)*(1 - t)^{-x - b}; c = 1/2; b = 1. A137376

Fermat pseudoprimes to base 2, also called Sarrus numbers or Poulet numbers. A1567

Carmichael numbers: composite numbers k such that a^k-1 == 1 (mod k) for every a coprime to k. A2997

3-Carmichael numbers: Carmichael numbers equal to the product of 3 primes: k = p·q*r, where p < q < r are primes such that a^k-1 == 1 (mod k) if a is prime to k. A87788

Centered 9-gonal (also known as nonagonal or enneagonal) numbers. Every third triangular number, starting with a(1)=1. A60544

a(n) is the limiting term of the n-th column of the triangle in A188919. A188920

Pseudoprimes to base 3. A5935

a(n) = (2·n+1)*(4·n+1). A14634

Strong pseudoprimes to base 3. A20229

Number of ordered triples (a, b, c) with gcd(a, b, c) = 1 and 1 <= {a, b, c} <= n. A71778