55111133 has 24 divisors (see below), whose sum is σ = 71163360. Its totient is φ = 42191520.

The previous prime is 55111073. The next prime is 55111139. The reversal of 55111133 is 33111155.

It is not a de Polignac number, because 55111133 - 2²⁰ = 54062557 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55111139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30935 + ... + 32667.

It is an arithmetic number, because the mean of its divisors is an integer number (2965140).

Almost surely, 2^55111133 is an apocalyptic number.

It is an amenable number.

55111133 is a deficient number, since it is larger than the sum of its proper divisors (16052227).

55111133 is a wasteful number, since it uses less digits than its factorization.

55111133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817 (or 1810 counting only the distinct ones).

The product of its digits is 225, while the sum is 20.

The square root of 55111133 is about 7423.6872913667. The cubic root of 55111133 is about 380.5512152744.

Adding to 55111133 its reverse (33111155), we get a palindrome (88222288).

The spelling of 55111133 in words is "fifty-five million, one hundred eleven thousand, one hundred thirty-three".