1121531042 has 4 divisors (see below), whose sum is σ = 1682296566. Its totient is φ = 560765520.

The previous prime is 1121531029. The next prime is 1121531071. The reversal of 1121531042 is 2401351211.

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

It can be written as a sum of positive squares in only one way, i.e., 726356401 + 395174641 = 26951^2 + 19879^2 .

It is an unprimeable number.

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, 280382759 + ... + 280382762.

Almost surely, 2^1121531042 is an apocalyptic number.

1121531042 is a deficient number, since it is larger than the sum of its proper divisors (560765524).

1121531042 is an equidigital number, since it uses as much as digits as its factorization.

1121531042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560765523.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1121531042 is about 33489.2675644004. The cubic root of 1121531042 is about 1038.9718148215.

Adding to 1121531042 its reverse (2401351211), we get a palindrome (3522882253).

The spelling of 1121531042 in words is "one billion, one hundred twenty-one million, five hundred thirty-one thousand, forty-two".