Prime Number Counter

A red button that animates to the next prime number

FunCoolApps · com.useless.primes

Not rated yet 10K+ downloads v1.6 1.1 MB Android 4.0+ PEGI 3 · Everyone

Download APK 1.1 MB All versions

Signature matches the Google Play version Details

Watch the Prime Number Counter trailer on YouTube

At a glance

Latest version: v1.6 (6)
Updated: Jan 13, 2026 (9 months ago)
APK size: 1.1 MB
Requires: Android 4.0+ (API 14)
CPU support: Any (no native code)
Category: Education (app)
Listed since: Oct 20, 2022 (at least)
Permissions: 1
Developer contact: [email protected]

About this APK

Prime Number Counter is an app by FunCoolApps in the Education category, listed since at least October 2022. It has no native code, so it runs on any Android processor.

Since version 1.5, the APK grew from 121.4 KB to 1.1 MB and the minimum Android version rose from 2.2 to 4.0. It asks for 1 permission, none of them sensitive.

What's new in v1.6

Support new Android versions

Description

From the listing uploaded by “appupdater”.

Shows a nice counter with a prime number. When you click the red button the counter animates to the next prime number. This app is for people who have fun watching prime numbers. The app is designed to imitate the Primer physical devices shown in this Numberphile video: http://www.youtube.com/watch?v=8UqCyepX3AI More on the Primer physical device: http://www.karllautman.com/primer.html

Version history

2 versions are listed, going back to v1.5. Since v1.6 it requires Android 4.0+.

v1.6 LATEST Jan 13, 2026 1.1 MB TRUSTED v1.5 May 28, 2024 121.4 KB TRUSTED

All 2 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Jan 13, 2026.
Certificate issued to “Unknown” This is the certificate of the Google Play version.
Same certificate as the other version checked

Store checks and file details

Developer signature verified Jan 13, 2026
Validated against Google Play Jan 13, 2026
Signed byCN=Unknown, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown
Signing certificate (SHA-1)DC:D7:F6:A2:41:27:04:55:3F:35:88:19:9D:08:21:65:79:E1:CD:64
File MD54eca50dbf7f153557264990bbed5f39e
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (1 other version compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (1)

Prime Number Counter requests 1 permission, none of them sensitive.

Internal broadcast protection (app-defined) com.useless.primes.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Required hardware & features

Basic touch input android.hardware.faketouch

Prime Number Counter APK: questions and answers

Is there a version of Prime Number Counter for older Android phones?

The current version needs Android 4.0 or later. Version 1.5 is the newest listed build that installs on Android 2.2 and later. It is an old build: apps that rely on online services may no longer connect when they are this old. Get version 1.5 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the Prime Number Counter APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the other version checked. After downloading, check that the file's MD5 is 4eca50dbf7f153557264990bbed5f39e.