55111120 has 20 divisors (see below), whose sum is σ = 128133540. Its totient is φ = 22044416.

The previous prime is 55111073. The next prime is 55111139. The reversal of 55111120 is 2111155.

55111120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6780816 + 48330304 = 2604^2 + 6952^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 55111094 and 55111103.

It is a congruent number.

It is an unprimeable number.

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, 344365 + ... + 344524.

It is an arithmetic number, because the mean of its divisors is an integer number (6406677).

Almost surely, 2^55111120 is an apocalyptic number.

It is an amenable number.

55111120 is an abundant number, since it is smaller than the sum of its proper divisors (73022420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55111120 is a wasteful number, since it uses less digits than its factorization.

55111120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688902 (or 688896 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 55111120 is about 7423.6864157910. The cubic root of 55111120 is about 380.5511853521.

Adding to 55111120 its reverse (2111155), we get a palindrome (57222275).

The spelling of 55111120 in words is "fifty-five million, one hundred eleven thousand, one hundred twenty".