55111817 has 4 divisors (see below), whose sum is σ = 55617540. Its totient is φ = 54606096.

The previous prime is 55111801. The next prime is 55111843. The reversal of 55111817 is 71811155.

It is a happy number.

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 18011536 + 37100281 = 4244^2 + 6091^2 .

It is a cyclic number.

It is not a de Polignac number, because 55111817 - 2⁴ = 55111801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55111817.

It is not an unprimeable number, because it can be changed into a prime (55111897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252698 + ... + 252915.

It is an arithmetic number, because the mean of its divisors is an integer number (13904385).

Almost surely, 2^55111817 is an apocalyptic number.

It is an amenable number.

55111817 is a deficient number, since it is larger than the sum of its proper divisors (505723).

55111817 is a wasteful number, since it uses less digits than its factorization.

55111817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505722.

The product of its digits is 1400, while the sum is 29.

The square root of 55111817 is about 7423.7333599746. The cubic root of 55111817 is about 380.5527896445.

The spelling of 55111817 in words is "fifty-five million, one hundred eleven thousand, eight hundred seventeen".