55111145 has 4 divisors (see below), whose sum is σ = 66133380. Its totient is φ = 44088912.

The previous prime is 55111141. The next prime is 55111159. The reversal of 55111145 is 54111155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39175081 + 15936064 = 6259^2 + 3992^2 .

It is a cyclic number.

It is not a de Polignac number, because 55111145 - 2² = 55111141 is a prime.

It is a super-2 number, since 2×55111145² = 6074476606422050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55111145.

It is not an unprimeable number, because it can be changed into a prime (55111141) 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, 5511110 + ... + 5511119.

It is an arithmetic number, because the mean of its divisors is an integer number (16533345).

Almost surely, 2^55111145 is an apocalyptic number.

It is an amenable number.

55111145 is a deficient number, since it is larger than the sum of its proper divisors (11022235).

55111145 is a wasteful number, since it uses less digits than its factorization.

55111145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11022234.

The product of its digits is 500, while the sum is 23.

The square root of 55111145 is about 7423.6880995904. The cubic root of 55111145 is about 380.5512428951.

The spelling of 55111145 in words is "fifty-five million, one hundred eleven thousand, one hundred forty-five".