1242343111 has 4 divisors (see below), whose sum is σ = 1242425512. Its totient is φ = 1242260712.

The previous prime is 1242343027. The next prime is 1242343121. The reversal of 1242343111 is 1113432421.

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 1242343111 - 2²¹ = 1240245959 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 (1242343121) 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, 11400 + ... + 51133.

It is an arithmetic number, because the mean of its divisors is an integer number (310606378).

Almost surely, 2^1242343111 is an apocalyptic number.

1242343111 is a deficient number, since it is larger than the sum of its proper divisors (82401).

1242343111 is an equidigital number, since it uses as much as digits as its factorization.

1242343111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82400.

The product of its digits is 576, while the sum is 22.

The square root of 1242343111 is about 35246.8879619180. The cubic root of 1242343111 is about 1075.0133363408.

Adding to 1242343111 its reverse (1113432421), we get a palindrome (2355775532).

The spelling of 1242343111 in words is "one billion, two hundred forty-two million, three hundred forty-three thousand, one hundred eleven".