1243311121 has 4 divisors (see below), whose sum is σ = 1338950452. Its totient is φ = 1147671792.

The previous prime is 1243311109. The next prime is 1243311143. The reversal of 1243311121 is 1211133421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 821624896 + 421686225 = 28664^2 + 20535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243311121 - 2⁷ = 1243310993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243311191) 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 in 3 ways as a sum of consecutive naturals, for example, 47819646 + ... + 47819671.

It is an arithmetic number, because the mean of its divisors is an integer number (334737613).

Almost surely, 2^1243311121 is an apocalyptic number.

It is an amenable number.

1243311121 is a deficient number, since it is larger than the sum of its proper divisors (95639331).

1243311121 is an equidigital number, since it uses as much as digits as its factorization.

1243311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95639330.

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

The square root of 1243311121 is about 35260.6171386719. The cubic root of 1243311121 is about 1075.2924738000.

Adding to 1243311121 its reverse (1211133421), we get a palindrome (2454444542).

The spelling of 1243311121 in words is "one billion, two hundred forty-three million, three hundred eleven thousand, one hundred twenty-one".