1131155 has 4 divisors (see below), whose sum is σ = 1357392. Its totient is φ = 904920.

The previous prime is 1131139. The next prime is 1131157. The reversal of 1131155 is 5511311.

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

It is not a de Polignac number, because 1131155 - 2⁴ = 1131139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131157) 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, 113111 + ... + 113120.

It is an arithmetic number, because the mean of its divisors is an integer number (339348).

2^1131155 is an apocalyptic number.

1131155 is a deficient number, since it is larger than the sum of its proper divisors (226237).

1131155 is an equidigital number, since it uses as much as digits as its factorization.

1131155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226236.

The product of its digits is 75, while the sum is 17.

The square root of 1131155 is about 1063.5577088245. The cubic root of 1131155 is about 104.1935191217.

Adding to 1131155 its reverse (5511311), we get a palindrome (6642466).

The spelling of 1131155 in words is "one million, one hundred thirty-one thousand, one hundred fifty-five".