4391121 has 16 divisors (see below), whose sum is σ = 6729728. Its totient is φ = 2494800.

The previous prime is 4391099. The next prime is 4391131. The reversal of 4391121 is 1211934.

It is not a de Polignac number, because 4391121 - 2⁵ = 4391089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is the 2096-th Hogben number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4391131) by changing a digit.

It is a nontrivial repunit in base 2095.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3936 + ... + 4926.

It is an arithmetic number, because the mean of its divisors is an integer number (420608).

Almost surely, 2^4391121 is an apocalyptic number.

It is an amenable number.

4391121 is a deficient number, since it is larger than the sum of its proper divisors (2338607).

4391121 is a wasteful number, since it uses less digits than its factorization.

4391121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212.

The product of its digits is 216, while the sum is 21.

The square root of 4391121 is about 2095.5001789549. The cubic root of 4391121 is about 163.7539563561.

The spelling of 4391121 in words is "four million, three hundred ninety-one thousand, one hundred twenty-one".