Properties of the Number -1911

Nine Hundred Eleven

Basics

Value: -1912 → -1911 → -1910

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 7 ² × 13

Divisors: 1, 3, 7, 13, 21, 39, 49, 91, 147, 273

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -11101110111

Octal: -3567

Duodecimal: -1133

Hexadecimal: -777

Square: 3651921

Square Root: 43.71498598878879

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(n) = ∑_k=0..n-1 8^k*B(k)*binomial(n,k) where B(k) is the k-th Bernoulli number. A83012

Triangle, read by rows, where the n-th row lists the (2·n+1) coefficients of (1 + x - 3·x²)ⁿ. A84614

Expansion of e.g.f. sinh(sin(x)*log(x+1)). A12284

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 289", based on the 5-celled von Neumann neighborhood. A271128

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 481", based on the 5-celled von Neumann neighborhood. A272458

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 485", based on the 5-celled von Neumann neighborhood. A272505

a(n) = sigma₂(n): sum of squares of divisors of n. A1157

11-gonal (or hendecagonal) numbers: a(n) = n*(9·n-7)/2. A51682

a(n) = ∑_k=1..n n/gcd(n,k). A57660

Numbers > 1000 such that all the substrings of length = 3 are primes (substrings with leading '0' are considered to be nonprime). A211684