1123531243 has 4 divisors (see below), whose sum is σ = 1137067848. Its totient is φ = 1109994640.

The previous prime is 1123531229. The next prime is 1123531249. The reversal of 1123531243 is 3421353211.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123531243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123531249) 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, 6768178 + ... + 6768343.

It is an arithmetic number, because the mean of its divisors is an integer number (284266962).

Almost surely, 2^1123531243 is an apocalyptic number.

1123531243 is a deficient number, since it is larger than the sum of its proper divisors (13536605).

1123531243 is an equidigital number, since it uses as much as digits as its factorization.

1123531243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13536604.

The product of its digits is 2160, while the sum is 25.

The square root of 1123531243 is about 33519.1175749004. The cubic root of 1123531243 is about 1039.5891014226.

Adding to 1123531243 its reverse (3421353211), we get a palindrome (4544884454).

The spelling of 1123531243 in words is "one billion, one hundred twenty-three million, five hundred thirty-one thousand, two hundred forty-three".