Abelian variety isogeny class 1.431.i over $\F_{431}$

• Label: 1.431.i
• Base field: $\F_{431}$
• Dimension: $1$
• $p$-rank: $1$
• Ordinary: yes
• Supersingular: no
• Simple: yes
• Geometrically simple: yes
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{431}$
Dimension:	$1$
L-polynomial:	$1 + 8 x + 431 x^{2}$
Frobenius angles:	$\pm0.561715730840$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-415}) \)
Galois group:	$C_2$
Jacobians:	$20$

This isogeny class is simple and geometrically simple, primitive, ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

This isogeny class is ordinary.

$p$-rank:	$1$
Slopes:	$[0, 1]$

Point counts

Point counts of the abelian variety

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$440$	$186560$	$80053160$	$34506883840$	$14872587631000$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$440$	$186560$	$80053160$	$34506883840$	$14872587631000$	$6410082591323840$	$2762745566261524360$	$1190743340457570831360$	$513210379739210388312440$	$221193673666980792480824000$

Jacobians and polarizations

This isogeny class contains the Jacobians of 20 curves (of which all are hyperelliptic), and hence is principally polarizable:

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{431}$.

Endomorphism algebra over $\F_{431}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-415}) \).

Base change

This is a primitive isogeny class.

Twists

Below is a list of all twists of this isogeny class.

Twist	Extension degree	Common base change
1.431.ai	$2$	(not in LMFDB)