1311333911 has 2 divisors, whose sum is σ = 1311333912. Its totient is φ = 1311333910.

The previous prime is 1311333893. The next prime is 1311333917. The reversal of 1311333911 is 1193331131.

It is a strong prime.

It is an emirp because it is prime and its reverse (1193331131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311333911 - 2⁶ = 1311333847 is a prime.

It is a super-2 number, since 2×1311333911² = 3439193252277111842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311333917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655666955 + 655666956.

It is an arithmetic number, because the mean of its divisors is an integer number (655666956).

Almost surely, 2^1311333911 is an apocalyptic number.

1311333911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311333911 is an equidigital number, since it uses as much as digits as its factorization.

1311333911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 729, while the sum is 26.

The square root of 1311333911 is about 36212.3447321490. The cubic root of 1311333911 is about 1094.5554407021. Note that the first 3 decimals are identical.

The spelling of 1311333911 in words is "one billion, three hundred eleven million, three hundred thirty-three thousand, nine hundred eleven".