1240342111 has 2 divisors, whose sum is σ = 1240342112. Its totient is φ = 1240342110.

The previous prime is 1240342109. The next prime is 1240342121. The reversal of 1240342111 is 1112430421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1240342111 - 2¹ = 1240342109 is a prime.

Together with 1240342109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240342121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620171055 + 620171056.

It is an arithmetic number, because the mean of its divisors is an integer number (620171056).

Almost surely, 2^1240342111 is an apocalyptic number.

1240342111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240342111 is an equidigital number, since it uses as much as digits as its factorization.

1240342111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1240342111 is about 35218.4910380896. The cubic root of 1240342111 is about 1074.4358636593.

Adding to 1240342111 its reverse (1112430421), we get a palindrome (2352772532).

The spelling of 1240342111 in words is "one billion, two hundred forty million, three hundred forty-two thousand, one hundred eleven".