2209145 has 4 divisors (see below), whose sum is σ = 2650980. Its totient is φ = 1767312.

The previous prime is 2209117. The next prime is 2209169. The reversal of 2209145 is 5419022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 678976 + 1530169 = 824^2 + 1237^2 .

It is a cyclic number.

It is not a de Polignac number, because 2209145 - 2⁸ = 2208889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2209145.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220910 + ... + 220919.

It is an arithmetic number, because the mean of its divisors is an integer number (662745).

2^2209145 is an apocalyptic number.

It is an amenable number.

2209145 is a deficient number, since it is larger than the sum of its proper divisors (441835).

2209145 is an equidigital number, since it uses as much as digits as its factorization.

2209145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441834.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2209145 is about 1486.3192792937. The cubic root of 2209145 is about 130.2391062982.

The spelling of 2209145 in words is "two million, two hundred nine thousand, one hundred forty-five".