55126209 has 4 divisors (see below), whose sum is σ = 73501616. Its totient is φ = 36750804.

The previous prime is 55126207. The next prime is 55126217. The reversal of 55126209 is 90262155.

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 not a de Polignac number, because 55126209 - 2¹ = 55126207 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 (55126207) 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, 9187699 + ... + 9187704.

It is an arithmetic number, because the mean of its divisors is an integer number (18375404).

Almost surely, 2^55126209 is an apocalyptic number.

It is an amenable number.

55126209 is a deficient number, since it is larger than the sum of its proper divisors (18375407).

55126209 is a wasteful number, since it uses less digits than its factorization.

55126209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18375406.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 55126209 is about 7424.7026203074. The cubic root of 55126209 is about 380.5859128436.

The spelling of 55126209 in words is "fifty-five million, one hundred twenty-six thousand, two hundred nine".