55111909 has 4 divisors (see below), whose sum is σ = 58353804. Its totient is φ = 51870016.

The previous prime is 55111897. The next prime is 55111957. The reversal of 55111909 is 90911155.

55111909 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.

It can be written as a sum of positive squares in 2 ways, for example, as 50722884 + 4389025 = 7122^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 55111909 - 2⁷ = 55111781 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 (55111009) 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 3 ways as a sum of consecutive naturals, for example, 1620922 + ... + 1620955.

It is an arithmetic number, because the mean of its divisors is an integer number (14588451).

Almost surely, 2^55111909 is an apocalyptic number.

It is an amenable number.

55111909 is a deficient number, since it is larger than the sum of its proper divisors (3241895).

55111909 is a wasteful number, since it uses less digits than its factorization.

55111909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241894.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 55111909 is about 7423.7395563153. The cubic root of 55111909 is about 380.5530014009.

The spelling of 55111909 in words is "fifty-five million, one hundred eleven thousand, nine hundred nine".