55252209 has 16 divisors (see below), whose sum is σ = 78267200. Its totient is φ = 34572096.

The previous prime is 55252207. The next prime is 55252319. The reversal of 55252209 is 90225255.

55252209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55252209 - 2¹ = 55252207 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55252207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1767 + ... + 10659.

It is an arithmetic number, because the mean of its divisors is an integer number (4891700).

Almost surely, 2^55252209 is an apocalyptic number.

It is an amenable number.

55252209 is a deficient number, since it is larger than the sum of its proper divisors (23014991).

55252209 is a wasteful number, since it uses less digits than its factorization.

55252209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9024.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 55252209 is about 7433.1829655942. The cubic root of 55252209 is about 380.8756560636.

The spelling of 55252209 in words is "fifty-five million, two hundred fifty-two thousand, two hundred nine".