Properties of the Number -425

Four Hundred Twenty-Five

Basics

Value: -426 → -425 → -424

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 5 ² × 17

Divisors: 1, 5, 17, 25, 85, 425

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110101001

Octal: -651

Duodecimal: -2B5

Hexadecimal: -1a9

Square: 180625

Square Root: 20.615528128088304

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

FP2 polynomials related to the generating functions of the left hand columns of the A156920 triangle. A156925

Alternating sum of cubes, i.e., ∑_k=0..n k^p*q^k for p=3, q=-1. A232599

G.f.: Im((i·x; x)_inf), where (a; q)_inf is the q-Pochhammer symbol, i = sqrt(-1). A292043

Inverse binomial transform of A140359. A140360

G.f. of the z² coefficients of the FP2 in the third column of the A156925 matrix. A156935

Start with 1, add the next number if one gets a prime then add the next number else subtract the next... A74170

For 1<=x<=n, 1<=y<=n, with gcd(x,y)=1, write 1 = gcd(x,y) = u·x+v·y with u,v minimal; a(n) = sum of the values of u+v. A345425

First differences of A066841. A140554

Coefficient array of orthogonal polynomials P(n,x)=(x-n)*P(n-1,x)-(2n-3)*P(n-2,x), P(0,x)=1,P(1,x)=x-1. A178124

Hankel transform of A191529. A283436