1121800055 has 16 divisors (see below), whose sum is σ = 1363068000. Its totient is φ = 886195200.

The previous prime is 1121800027. The next prime is 1121800081. The reversal of 1121800055 is 5500081211.

It is not a de Polignac number, because 1121800055 - 2⁸ = 1121799799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1121800055.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 533396 + ... + 535494.

It is an arithmetic number, because the mean of its divisors is an integer number (85191750).

Almost surely, 2^1121800055 is an apocalyptic number.

1121800055 is a deficient number, since it is larger than the sum of its proper divisors (241267945).

1121800055 is a wasteful number, since it uses less digits than its factorization.

1121800055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 1121800055 is about 33493.2837297271. The cubic root of 1121800055 is about 1039.0548782323.

Adding to 1121800055 its reverse (5500081211), we get a palindrome (6621881266).

The spelling of 1121800055 in words is "one billion, one hundred twenty-one million, eight hundred thousand, fifty-five".