1131156 has 36 divisors (see below), whose sum is σ = 3080532. Its totient is φ = 347904.

The previous prime is 1131139. The next prime is 1131157. The reversal of 1131156 is 6511311.

It can be written as a sum of positive squares in 2 ways, for example, as 695556 + 435600 = 834^2 + 660^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 741 + ... + 1676.

2^1131156 is an apocalyptic number.

It is an amenable number.

1131156 is an abundant number, since it is smaller than the sum of its proper divisors (1949376).

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

1131156 is a wasteful number, since it uses less digits than its factorization.

1131156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440 (or 2435 counting only the distinct ones).

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

The square root of 1131156 is about 1063.5581789446. The cubic root of 1131156 is about 104.1935498259.

Adding to 1131156 its reverse (6511311), we get a palindrome (7642467).

The spelling of 1131156 in words is "one million, one hundred thirty-one thousand, one hundred fifty-six".