55109120 has 160 divisors (see below), whose sum is σ = 153204480. Its totient is φ = 18800640.

The previous prime is 55109113. The next prime is 55109129. The reversal of 55109120 is 2190155.

It is a tau number, because it is divible by the number of its divisors (160).

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55109129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534989 + ... + 535091.

It is an arithmetic number, because the mean of its divisors is an integer number (957528).

Almost surely, 2^55109120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55109120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76602240).

55109120 is an abundant number, since it is smaller than the sum of its proper divisors (98095360).

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

55109120 is a wasteful number, since it uses less digits than its factorization.

55109120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 55109120 is about 7423.5517106032. The cubic root of 55109120 is about 380.5465818554.

Adding to 55109120 its reverse (2190155), we get a palindrome (57299275).

The spelling of 55109120 in words is "fifty-five million, one hundred nine thousand, one hundred twenty".