1131543 has 16 divisors (see below), whose sum is σ = 1916160. Its totient is φ = 646488.

The previous prime is 1131523. The next prime is 1131547. The reversal of 1131543 is 3451311.

It is not a de Polignac number, because 1131543 - 2⁶ = 1131479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2805 + ... + 3182.

It is an arithmetic number, because the mean of its divisors is an integer number (119760).

2^1131543 is an apocalyptic number.

1131543 is a deficient number, since it is larger than the sum of its proper divisors (784617).

1131543 is an equidigital number, since it uses as much as digits as its factorization.

1131543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6003 (or 5997 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 1131543 is about 1063.7400998364. The cubic root of 1131543 is about 104.2054309770.

Adding to 1131543 its reverse (3451311), we get a palindrome (4582854).

The spelling of 1131543 in words is "one million, one hundred thirty-one thousand, five hundred forty-three".