1155122555 has 4 divisors (see below), whose sum is σ = 1386147072. Its totient is φ = 924098040.

The previous prime is 1155122543. The next prime is 1155122569. The reversal of 1155122555 is 5552215511.

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

It is not a de Polignac number, because 1155122555 - 2⁸ = 1155122299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115512251 + ... + 115512260.

It is an arithmetic number, because the mean of its divisors is an integer number (346536768).

Almost surely, 2^1155122555 is an apocalyptic number.

1155122555 is a deficient number, since it is larger than the sum of its proper divisors (231024517).

1155122555 is an equidigital number, since it uses as much as digits as its factorization.

1155122555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231024516.

The product of its digits is 12500, while the sum is 32.

The square root of 1155122555 is about 33987.0939475560. The cubic root of 1155122555 is about 1049.2428570364.

The spelling of 1155122555 in words is "one billion, one hundred fifty-five million, one hundred twenty-two thousand, five hundred fifty-five".