1311213111 has 16 divisors (see below), whose sum is σ = 1993519584. Its totient is φ = 759435264.

The previous prime is 1311213083. The next prime is 1311213121. The reversal of 1311213111 is 1113121131.

1311213111 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1311213111 - 2⁹ = 1311212599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311213121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 988186 + ... + 989511.

It is an arithmetic number, because the mean of its divisors is an integer number (124594974).

Almost surely, 2^1311213111 is an apocalyptic number.

1311213111 is a deficient number, since it is larger than the sum of its proper divisors (682306473).

1311213111 is a wasteful number, since it uses less digits than its factorization.

1311213111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977730.

The product of its digits is 18, while the sum is 15.

The square root of 1311213111 is about 36210.6767542392. The cubic root of 1311213111 is about 1094.5218295432.

Adding to 1311213111 its reverse (1113121131), we get a palindrome (2424334242).

The spelling of 1311213111 in words is "one billion, three hundred eleven million, two hundred thirteen thousand, one hundred eleven".