5555611121 has 4 divisors (see below), whose sum is σ = 5556065700. Its totient is φ = 5555156544.

The previous prime is 5555611111. The next prime is 5555611147. The reversal of 5555611121 is 1211165555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1211165555 = 5 ⋅242233111.

It can be written as a sum of positive squares in 2 ways, for example, as 4373970496 + 1181640625 = 66136^2 + 34375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5555611121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5555611111) 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, 208436 + ... + 233573.

It is an arithmetic number, because the mean of its divisors is an integer number (1389016425).

Almost surely, 2^5555611121 is an apocalyptic number.

It is an amenable number.

5555611121 is a deficient number, since it is larger than the sum of its proper divisors (454579).

5555611121 is a wasteful number, since it uses less digits than its factorization.

5555611121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454578.

The product of its digits is 7500, while the sum is 32.

The square root of 5555611121 is about 74535.9719933939. The cubic root of 5555611121 is about 1771.1035199942.

Adding to 5555611121 its reverse (1211165555), we get a palindrome (6766776676).

The spelling of 5555611121 in words is "five billion, five hundred fifty-five million, six hundred eleven thousand, one hundred twenty-one".