2205145 has 4 divisors (see below), whose sum is σ = 2646180. Its totient is φ = 1764112.

The previous prime is 2205139. The next prime is 2205149. The reversal of 2205145 is 5415022.

2205145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5415022 = 2 ⋅2707511.

It can be written as a sum of positive squares in 2 ways, for example, as 1032256 + 1172889 = 1016^2 + 1083^2 .

It is a cyclic number.

It is not a de Polignac number, because 2205145 - 2⁵ = 2205113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2205149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220510 + ... + 220519.

It is an arithmetic number, because the mean of its divisors is an integer number (661545).

2^2205145 is an apocalyptic number.

It is an amenable number.

2205145 is a deficient number, since it is larger than the sum of its proper divisors (441035).

2205145 is an equidigital number, since it uses as much as digits as its factorization.

2205145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441034.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2205145 is about 1484.9730637288. The cubic root of 2205145 is about 130.1604527669.

The spelling of 2205145 in words is "two million, two hundred five thousand, one hundred forty-five".