1111243123 has 4 divisors (see below), whose sum is σ = 1111347400. Its totient is φ = 1111138848.

The previous prime is 1111243099. The next prime is 1111243129. The reversal of 1111243123 is 3213421111.

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 1111243123 - 2⁹ = 1111242611 is a prime.

It is a super-2 number, since 2×1111243123² = 2469722556829586258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111243123.

It is not an unprimeable number, because it can be changed into a prime (1111243129) 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, 34065 + ... + 58162.

It is an arithmetic number, because the mean of its divisors is an integer number (277836850).

Almost surely, 2^1111243123 is an apocalyptic number.

1111243123 is a deficient number, since it is larger than the sum of its proper divisors (104277).

1111243123 is an equidigital number, since it uses as much as digits as its factorization.

1111243123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104276.

The product of its digits is 144, while the sum is 19.

The square root of 1111243123 is about 33335.3134528536. The cubic root of 1111243123 is about 1035.7851861901.

Adding to 1111243123 its reverse (3213421111), we get a palindrome (4324664234).

The spelling of 1111243123 in words is "one billion, one hundred eleven million, two hundred forty-three thousand, one hundred twenty-three".