1311111211 has 2 divisors, whose sum is σ = 1311111212. Its totient is φ = 1311111210.

The previous prime is 1311111203. The next prime is 1311111223. The reversal of 1311111211 is 1121111131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311111211 - 2³ = 1311111203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311111191 and 1311111200.

It is not a weakly prime, because it can be changed into another prime (1311112211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655555605 + 655555606.

It is an arithmetic number, because the mean of its divisors is an integer number (655555606).

Almost surely, 2^1311111211 is an apocalyptic number.

1311111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311111211 is an equidigital number, since it uses as much as digits as its factorization.

1311111211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6, while the sum is 13.

The square root of 1311111211 is about 36209.2696833283. The cubic root of 1311111211 is about 1094.4934754786.

Adding to 1311111211 its reverse (1121111131), we get a palindrome (2432222342).

The spelling of 1311111211 in words is "one billion, three hundred eleven million, one hundred eleven thousand, two hundred eleven".