1311243402111 has 16 divisors (see below), whose sum is σ = 1749087774720. Its totient is φ = 873780747840.

The previous prime is 1311243402107. The next prime is 1311243402143. The reversal of 1311243402111 is 1112043421131.

It is not a de Polignac number, because 1311243402111 - 2² = 1311243402107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311243402151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115818331 + ... + 115829651.

It is an arithmetic number, because the mean of its divisors is an integer number (109317985920).

Almost surely, 2^{1311243402111} is an apocalyptic number.

1311243402111 is a deficient number, since it is larger than the sum of its proper divisors (437844372609).

1311243402111 is a wasteful number, since it uses less digits than its factorization.

1311243402111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24766.

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 1311243402111 its reverse (1112043421131), we get a palindrome (2423286823242).

The spelling of 1311243402111 in words is "one trillion, three hundred eleven billion, two hundred forty-three million, four hundred two thousand, one hundred eleven".