Properties of the Number -645120

Six Hundred Forty-Five Thousand One Hundred Twenty

Basics

Value: -645121 → -645120 → -645119

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ¹¹ × 3 ² × 5 × 7

Divisors: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10011101100000000000

Octal: -2354000

Duodecimal: -271400

Hexadecimal: -9d800

Square: 416179814400

Square Root: 803.1936254727125

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

Signed double Pochhammer triangle: expansion of x(x-2)(x-4)..(x-2n+2). A39683

Triangle of coefficients of n!*(1 - x)ⁿ*L_n(x/(1 - x)), where L_n(x) is the Laguerre polynomial. A123202

Triangle of coefficients of even modified recursive orthogonal Hermite polynomials given in Hochstadt's book:P(x, n) = x·P(x, n - 1) - n·P(x, n - 2) ;A137286; P2(x,n)=P(x,n)+P(x,2·n): second type. A136587

Triangle read by rows: expansion of p(t) = (1 + t)^x/(1 + (1 + t)ⁿ) with weight factor 2ⁿ⁺¹*n!. A137369

A triangular sequence from coefficients of an expansion of the Poisson's kernel: p(t,r)=(1-r²)/(1-2·r*Cos(t)+r²): r->t;Cos(t)->x. A137511

A triangular sequence from an expansion of coefficients of the function: p(x,t)=Exp(x·g*(t))*(1-f(t)²);f(t)=4/(t⁴-1);g(t)=t. (based on the Weierstrass functions of Scherk's minimal surface). A137520

Triangular sequence from coefficients of an expansion of a Rankine-Hugoniot relation function for density in terms of thermodynamic γ as t and pressure ratio as x: p(x,t)=((t + 1)/(t - 1) + x)/(1 + (t + 1)*x/(t - 1)). A137778

Double factorials n!!: a(n) = n·a(n-2) for n > 1, a(0) = a(1) = 1. A6882

Double factorial of even numbers: (2n)!! = 2ⁿ*n!. A165

Triangle read by rows: terms T(n,k) of a binomial decomposition of n*(n-1) as Sum(k=0..n)T(n,k). A244139