1243241111 has 4 divisors (see below), whose sum is σ = 1420846992. Its totient is φ = 1065635232.

The previous prime is 1243241071. The next prime is 1243241141. The reversal of 1243241111 is 1111423421.

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

It is a cyclic number.

It is not a de Polignac number, because 1243241111 - 2⁶ = 1243241047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243241141) 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, 88802930 + ... + 88802943.

It is an arithmetic number, because the mean of its divisors is an integer number (355211748).

Almost surely, 2^1243241111 is an apocalyptic number.

1243241111 is a deficient number, since it is larger than the sum of its proper divisors (177605881).

1243241111 is an equidigital number, since it uses as much as digits as its factorization.

1243241111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177605880.

The product of its digits is 192, while the sum is 20.

The square root of 1243241111 is about 35259.6243740628. The cubic root of 1243241111 is about 1075.2722904263.

Adding to 1243241111 its reverse (1111423421), we get a palindrome (2354664532).

The spelling of 1243241111 in words is "one billion, two hundred forty-three million, two hundred forty-one thousand, one hundred eleven".