55205111 has 4 divisors (see below), whose sum is σ = 59451672. Its totient is φ = 50958552.

The previous prime is 55205099. The next prime is 55205123. The reversal of 55205111 is 11150255.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11150255 = 5 ⋅2230051.

It is an interprime number because it is at equal distance from previous prime (55205099) and next prime (55205123).

It is a cyclic number.

It is not a de Polignac number, because 55205111 - 2²² = 51010807 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 (55205131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123261 + ... + 2123286.

It is an arithmetic number, because the mean of its divisors is an integer number (14862918).

Almost surely, 2^55205111 is an apocalyptic number.

55205111 is a deficient number, since it is larger than the sum of its proper divisors (4246561).

55205111 is a wasteful number, since it uses less digits than its factorization.

55205111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246560.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 55205111 is about 7430.0141991789. The cubic root of 55205111 is about 380.7674034922.

Adding to 55205111 its reverse (11150255), we get a palindrome (66355366).

The spelling of 55205111 in words is "fifty-five million, two hundred five thousand, one hundred eleven".