1121516243 has 4 divisors (see below), whose sum is σ = 1121617920. Its totient is φ = 1121414568.

The previous prime is 1121516237. The next prime is 1121516267. The reversal of 1121516243 is 3426151211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121516243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121536243) 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, 31955 + ... + 57132.

It is an arithmetic number, because the mean of its divisors is an integer number (280404480).

Almost surely, 2^1121516243 is an apocalyptic number.

1121516243 is a deficient number, since it is larger than the sum of its proper divisors (101677).

1121516243 is an equidigital number, since it uses as much as digits as its factorization.

1121516243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101676.

The product of its digits is 1440, while the sum is 26.

The square root of 1121516243 is about 33489.0466122880. The cubic root of 1121516243 is about 1038.9672449342.

Adding to 1121516243 its reverse (3426151211), we get a palindrome (4547667454).

The spelling of 1121516243 in words is "one billion, one hundred twenty-one million, five hundred sixteen thousand, two hundred forty-three".