1131165 has 72 divisors (see below), whose sum is σ = 2489760. Its totient is φ = 489888.

The previous prime is 1131157. The next prime is 1131181. The reversal of 1131165 is 5611311.

It is not a de Polignac number, because 1131165 - 2³ = 1131157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 59526 + ... + 59544.

It is an arithmetic number, because the mean of its divisors is an integer number (34580).

2^1131165 is an apocalyptic number.

1131165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131165 is an abundant number, since it is smaller than the sum of its proper divisors (1358595).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131165 is an equidigital number, since it uses as much as digits as its factorization.

1131165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53 (or 34 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 1131165 is about 1063.5624100165. The cubic root of 1131165 is about 104.1938261625.

Adding to 1131165 its reverse (5611311), we get a palindrome (6742476).

It can be divided in two parts, 1131 and 165, that added together give a 4-th power (1296 = 6⁴).

The spelling of 1131165 in words is "one million, one hundred thirty-one thousand, one hundred sixty-five".