Properties of the Number -90

Ninety

Basics

Value: -91 → -90 → -89

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 5

Divisors: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1011010

Octal: -132

Duodecimal: -76

Hexadecimal: -5a

Square: 8100

Square Root: 9.486832980505138

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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

Coefficients of list partition transform: reciprocal of an exponential generating function (e.g.f.). A133314

a(n) = (n+1)*(2-n)/2. A80956

Coefficient of p(y) / A056239(n)! in ∏_{i >= 1} (1 + x_i), where p is power-sum symmetric functions and y is the integer partition with Heinz number n. A319191

Triangle read by rows: T(n,k) = T(n-1,k-1) + T(n-1,k), 0 < k < n with T(n,0) = n and T(n,n) = -n. A214292

Inverse binomial transform of {1, primes}. A30016

Triangle read by rows: terms T(n,k) of a binomial decomposition of nⁿ as Sum(k=0..n)T(n,k). A244123

Expansion of q^-1/4 * (η(q) * η(q⁴)² / η(q²)³)² in powers of q. A79006

Expansion of square root of q times normalized Hauptmodul for γ(4) in powers of q⁸. A29838

Riordan array ((1-2x)/(1-x), x/(1-x)). A112467

Coefficients for the commutator for the logarithm of the derivative operator [log(D),xⁿ Dⁿ]=d[(xD)!/(xD-n)!]/d(xD) expanded in the operators :xD:^k. A238363