1121512243 has 4 divisors (see below), whose sum is σ = 1121595768. Its totient is φ = 1121428720.

The previous prime is 1121512211. The next prime is 1121512289. The reversal of 1121512243 is 3422151211.

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 not a de Polignac number, because 1121512243 - 2⁵ = 1121512211 is a prime.

It is a super-2 number, since 2×1121512243² = 2515579422397782098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121512043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16546 + ... + 50167.

It is an arithmetic number, because the mean of its divisors is an integer number (280398942).

Almost surely, 2^1121512243 is an apocalyptic number.

1121512243 is a deficient number, since it is larger than the sum of its proper divisors (83525).

1121512243 is an equidigital number, since it uses as much as digits as its factorization.

1121512243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83524.

The product of its digits is 480, while the sum is 22.

The square root of 1121512243 is about 33488.9868912154. The cubic root of 1121512243 is about 1038.9660097392.

Adding to 1121512243 its reverse (3422151211), we get a palindrome (4543663454).

The spelling of 1121512243 in words is "one billion, one hundred twenty-one million, five hundred twelve thousand, two hundred forty-three".