55112181 has 16 divisors (see below), whose sum is σ = 78312384. Its totient is φ = 34354944.

The previous prime is 55112149. The next prime is 55112191. The reversal of 55112181 is 18121155.

It is not a de Polignac number, because 55112181 - 2⁵ = 55112149 is a prime.

It is a super-2 number, since 2×55112181² = 6074704989153522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55112191) 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, 4566 + ... + 11448.

It is an arithmetic number, because the mean of its divisors is an integer number (4894524).

Almost surely, 2^55112181 is an apocalyptic number.

55112181 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55112181 is a deficient number, since it is larger than the sum of its proper divisors (23200203).

55112181 is a wasteful number, since it uses less digits than its factorization.

55112181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7060.

The product of its digits is 400, while the sum is 24.

The square root of 55112181 is about 7423.7578759009. The cubic root of 55112181 is about 380.5536274619.

The spelling of 55112181 in words is "fifty-five million, one hundred twelve thousand, one hundred eighty-one".