1121542243 has 2 divisors, whose sum is σ = 1121542244. Its totient is φ = 1121542242.

The previous prime is 1121542229. The next prime is 1121542267. The reversal of 1121542243 is 3422451211.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121542243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121542943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560771121 + 560771122.

It is an arithmetic number, because the mean of its divisors is an integer number (560771122).

Almost surely, 2^1121542243 is an apocalyptic number.

1121542243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121542243 is an equidigital number, since it uses as much as digits as its factorization.

1121542243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 25.

The square root of 1121542243 is about 33489.4347966639. The cubic root of 1121542243 is about 1038.9752736304.

Adding to 1121542243 its reverse (3422451211), we get a palindrome (4543993454).

The spelling of 1121542243 in words is "one billion, one hundred twenty-one million, five hundred forty-two thousand, two hundred forty-three".