1115542243 has 4 divisors (see below), whose sum is σ = 1116153328. Its totient is φ = 1114931160.

The previous prime is 1115542237. The next prime is 1115542367. The reversal of 1115542243 is 3422455111.

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

It is a cyclic number.

It is not a de Polignac number, because 1115542243 - 2¹³ = 1115534051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1115512243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302796 + ... + 306457.

It is an arithmetic number, because the mean of its divisors is an integer number (279038332).

Almost surely, 2^1115542243 is an apocalyptic number.

1115542243 is a deficient number, since it is larger than the sum of its proper divisors (611085).

1115542243 is an equidigital number, since it uses as much as digits as its factorization.

1115542243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611084.

The product of its digits is 4800, while the sum is 28.

The square root of 1115542243 is about 33399.7341755889. The cubic root of 1115542243 is about 1037.1191980913.

Adding to 1115542243 its reverse (3422455111), we get a palindrome (4537997354).

The spelling of 1115542243 in words is "one billion, one hundred fifteen million, five hundred forty-two thousand, two hundred forty-three".