2205391 has 4 divisors (see below), whose sum is σ = 2214784. Its totient is φ = 2196000.

The previous prime is 2205389. The next prime is 2205409. The reversal of 2205391 is 1935022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1935022 = 2 ⋅967511.

It is a cyclic number.

It is not a de Polignac number, because 2205391 - 2¹ = 2205389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2200391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4335 + ... + 4816.

It is an arithmetic number, because the mean of its divisors is an integer number (553696).

2^2205391 is an apocalyptic number.

2205391 is a deficient number, since it is larger than the sum of its proper divisors (9393).

2205391 is an equidigital number, since it uses as much as digits as its factorization.

2205391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9392.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 2205391 is about 1485.0558912041. The cubic root of 2205391 is about 130.1652927028.

The spelling of 2205391 in words is "two million, two hundred five thousand, three hundred ninety-one".