Properties of the Number -1156

One Hundred Fifty-Six

Basics

Value: -1157 → -1156 → -1155

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 17 ²

Divisors: 1, 2, 4, 17, 34, 68, 289, 578, 1156

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10010000100

Octal: -2204

Duodecimal: -804

Hexadecimal: -484

Square: 1336336

Square Root: 34

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) = prime(n+3)*prime(n) - prime(n+1)*prime(n+2). A117301

a(n) = -(-1)ⁿ * n². A162395

a(1) = 1; a(n) = n² * ∑_{d∣n, d < n} (-1)^n/d a(d) / d². A361987

a(n) = ( a(n-1) * a(n-3) + a(n-2) ) / a(n-4), a(1) = a(2) = 1, a(3) = -1, a(4) = -4. A206282

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 251", based on the 5-celled von Neumann neighborhood. A271019

A triangular sequence based on second integer differential using columns n and rows m, in the ChebyshevT T(n,m): d20(n,m)=T(n+2,m)-2·T(n+1,m)+T(n,m); d02(n,m)=T(n,m+2)-2·T(n,m+1)+T(n,m); D2(n,m)=d20(n,m)+d02(n,m). A140877

The squares: a(n) = n². A290

Perfect powers: m^k where m > 0 and k >= 2. A1597

Product of divisors of n. A7955

Powerful numbers (A001694) that are not prime powers (A000961). A286708