1131138 has 16 divisors (see below), whose sum is σ = 2513760. Its totient is φ = 377028.

The previous prime is 1131133. The next prime is 1131139. The reversal of 1131138 is 8311311.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1131138.

It is not an unprimeable number, because it can be changed into a prime (1131131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10420 + ... + 10527.

It is an arithmetic number, because the mean of its divisors is an integer number (157110).

2^1131138 is an apocalyptic number.

1131138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1131138 is an abundant number, since it is smaller than the sum of its proper divisors (1382622).

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

1131138 is a wasteful number, since it uses less digits than its factorization.

1131138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20958 (or 20952 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1131138 is about 1063.5497167505. The cubic root of 1131138 is about 104.1929971483.

Adding to 1131138 its reverse (8311311), we get a palindrome (9442449).

The spelling of 1131138 in words is "one million, one hundred thirty-one thousand, one hundred thirty-eight".