Factoring $n$ when $\phi(n)$ is given?
105623
Prime factorization knowing n and Euler's function
121723
$\phi(n)=\frac{n}{2}$ if and only if $n=2^k$ for some positive integer k
37012
The number of summands $\phi(n)$
121404
How to factor polynomials in $\mathbb{Z}_n$?
4530
For which natural numbers are $\phi(n)=2$?
136918
How to determine the smallest numbers with $n$ factors
100515
Prove that if $d$ divides $n$ then $φ(d)$ divide $φ(n)$ for $φ$ denotes Euler’s φ-function.
125188
how to prove $m^{\phi(n)}+n^{\phi(m)}\equiv 1 \pmod{mn}$ where m and n are relatively prime?
136077
Prove that $x-1$ is a factor of $x^n-1$
81346
Let $r$ be the smallest positive integer such that $a^r \equiv 1 \bmod{n}$. Prove $r \mid \phi(n)$.
45498
Building a hard to factor number without knowing its factorization
82878
Order of cyclic groups and the Euler phi function
61858
Is there $\phi(n)=n/6$
9753
How to solve the equation $\phi(n) = k$?
53745
Euler's $\phi$ function: Find all $n$ such that $\phi(n)=n/3$
9217
Find $n$ such that $x^2 + x + 1$ is a factor of $(x+1)^n - x^n - 1$.
148671
Trying to factor $x^4-3$ over $\Bbb{F}_p$ with $p\equiv 3\mod{4}$