1131044155 has 4 divisors (see below), whose sum is σ = 1357252992. Its totient is φ = 904835320.

The previous prime is 1131044149. The next prime is 1131044191. The reversal of 1131044155 is 5514401311.

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

It is not a de Polignac number, because 1131044155 - 2³ = 1131044147 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, 113104411 + ... + 113104420.

It is an arithmetic number, because the mean of its divisors is an integer number (339313248).

Almost surely, 2^1131044155 is an apocalyptic number.

1131044155 is a deficient number, since it is larger than the sum of its proper divisors (226208837).

1131044155 is an equidigital number, since it uses as much as digits as its factorization.

1131044155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226208836.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1131044155 is about 33630.9999107966. Note that the first 4 decimals coincide. The cubic root of 1131044155 is about 1041.9011560706.

Adding to 1131044155 its reverse (5514401311), we get a palindrome (6645445466).

The spelling of 1131044155 in words is "one billion, one hundred thirty-one million, forty-four thousand, one hundred fifty-five".