1123513243 has 2 divisors, whose sum is σ = 1123513244. Its totient is φ = 1123513242.

The previous prime is 1123513241. The next prime is 1123513271. The reversal of 1123513243 is 3423153211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1123513243 - 2¹ = 1123513241 is a prime.

Together with 1123513241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1123513241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561756621 + 561756622.

It is an arithmetic number, because the mean of its divisors is an integer number (561756622).

Almost surely, 2^1123513243 is an apocalyptic number.

1123513243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123513243 is an equidigital number, since it uses as much as digits as its factorization.

1123513243 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1123513243 is about 33518.8490703365. The cubic root of 1123513243 is about 1039.5835496696.

Adding to 1123513243 its reverse (3423153211), we get a palindrome (4546666454).

The spelling of 1123513243 in words is "one billion, one hundred twenty-three million, five hundred thirteen thousand, two hundred forty-three".