2208445909 has 4 divisors (see below), whose sum is σ = 2221670304. Its totient is φ = 2195221516.

The previous prime is 2208445873. The next prime is 2208445913. The reversal of 2208445909 is 9095448022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2208445909 - 2⁹ = 2208445397 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 (2208445409) 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, 6611947 + ... + 6612280.

It is an arithmetic number, because the mean of its divisors is an integer number (555417576).

Almost surely, 2^2208445909 is an apocalyptic number.

It is an amenable number.

2208445909 is a deficient number, since it is larger than the sum of its proper divisors (13224395).

2208445909 is a wasteful number, since it uses less digits than its factorization.

2208445909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13224394.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 2208445909 is about 46994.1050452075. The cubic root of 2208445909 is about 1302.2536665490.

The spelling of 2208445909 in words is "two billion, two hundred eight million, four hundred forty-five thousand, nine hundred nine".