2055555121 has 4 divisors (see below), whose sum is σ = 2055667572. Its totient is φ = 2055442672.

The previous prime is 2055555107. The next prime is 2055555163. The reversal of 2055555121 is 1215555502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 372914721 + 1682640400 = 19311^2 + 41020^2 .

It is a cyclic number.

It is not a de Polignac number, because 2055555121 - 2¹³ = 2055546929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2055555521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21766 + ... + 67711.

It is an arithmetic number, because the mean of its divisors is an integer number (513916893).

Almost surely, 2^2055555121 is an apocalyptic number.

It is an amenable number.

2055555121 is a deficient number, since it is larger than the sum of its proper divisors (112451).

2055555121 is an equidigital number, since it uses as much as digits as its factorization.

2055555121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112450.

The product of its (nonzero) digits is 12500, while the sum is 31.

The square root of 2055555121 is about 45338.2302367439. The cubic root of 2055555121 is about 1271.4805147096.

The spelling of 2055555121 in words is "two billion, fifty-five million, five hundred fifty-five thousand, one hundred twenty-one".