Properties of the Number -1656

Six Hundred Fifty-Six

Basics

Value: -1657 → -1656 → -1655

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ³ × 3 ² × 23

Divisors: 1, 2, 3, 4, 6, 8, 9, 12, 18, 23

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11001111000

Octal: -3170

Duodecimal: -B60

Hexadecimal: -678

Square: 2742336

Square Root: 40.69397989875161

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) = 1·2*3·4 - 5·6*7·8 + 9·10·11·12 - 13·14·15·16 + ... - (up to n). A319544

a(n) = 4·3*2·1 - 8·7*6·5 + 12·11·10·9 - 16·15·14·13 + ... - (up to the n-th term). A319887

Expansion of ∏_k>0 1/(1 + x^k)^k·3. A279031

Matrix inverse of triangle A121336, where A121336(n,k) = C( n*(n+1)/2 + n-k + 2, n-k) for n>=k>=0. A121441

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f.: ∏_j>0 (1-j^k*x^j)^1/j. A294616

Convolution of A075298 with A056594. A75495

Triangle (read by rows) of coefficients of the polynomials (in ascending order) of the denominators of the generalized sequence of fractions f(n) defined recursively by f(1) = m/1; f(n+1) is chosen so that the sum and the product of the first n terms of the sequence are equal. A225200

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 157", based on the 5-celled von Neumann neighborhood. A270332

sech(exp(x)-sec(x))=1-1/2!*x²+1/4!*x⁴+20/5!*x⁵+23/6!*x⁶... A13339

Inverse binomial transform of A143025, assuming offset zero there. A173435