1311131111 has 2 divisors, whose sum is σ = 1311131112. Its totient is φ = 1311131110.

The previous prime is 1311131089. The next prime is 1311131117. The reversal of 1311131111 is 1111311131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311131111 - 2¹⁰ = 1311130087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311131117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655565555 + 655565556.

It is an arithmetic number, because the mean of its divisors is an integer number (655565556).

Almost surely, 2^1311131111 is an apocalyptic number.

1311131111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311131111 is an equidigital number, since it uses as much as digits as its factorization.

1311131111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9, while the sum is 14.

The square root of 1311131111 is about 36209.5444737986. The cubic root of 1311131111 is about 1094.4990128451.

Adding to 1311131111 its reverse (1111311131), we get a palindrome (2422442242).

It can be divided in two parts, 1311131 and 111, that multiplied together give a palindrome (145535541).

The spelling of 1311131111 in words is "one billion, three hundred eleven million, one hundred thirty-one thousand, one hundred eleven".