Properties of the Number -89

Eighty-Nine

Basics

Value: -90 → -89 → -88

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 89

Divisors: 1, 89

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1011001

Octal: -131

Duodecimal: -75

Hexadecimal: -59

Square: 7921

Square Root: 9.433981132056603

Classification

Fibonacci: Yes

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

Lucas and Lehmer numbers with parameters (1 +- sqrt(-7))/2. A107920

Second differences of consecutive perfect powers (A001597). First differences of A053289. A376559

a(n) = -a(n-1) - 2·a(n-2). A1607

a(n) = a(n-1) - a(n-3) with a(1)=0, a(2)=0, a(3)=1. A50935

Define E(n) = ∑_{k >= 0} (-1)^floor(k/3)*kⁿ/k! for n = 0,1,2,... . Then E(n) is an integral linear combination of E(0), E(1) and E(2). This sequence lists the coefficients of E(0). A143628

Rectangular array: A(n,k) = ∑_j=0..k (-1)^floor(j/2)*binomial(k-floor((j+1)/2), floor(j/2))*(-n)^k-j, n >= 1, k >= 0, read by antidiagonals. A299045

Reversal of n in balanced ternary representation. A134028

G.f. A(x) satisfies (1+x) = ∏_n>=1 A(xⁿ). A117210

a(n) = A000728(5·n). A282937

Convolution inverse of A006171. A288098