1311611311 has 2 divisors, whose sum is σ = 1311611312. Its totient is φ = 1311611310.

The previous prime is 1311611269. The next prime is 1311611347. The reversal of 1311611311 is 1131161131.

It is a strong prime.

It is an emirp because it is prime and its reverse (1131161131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311611311 - 2⁹ = 1311610799 is a prime.

It is a super-2 number, since 2×1311611311² = 3440648462286277442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311611911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655805655 + 655805656.

It is an arithmetic number, because the mean of its divisors is an integer number (655805656).

Almost surely, 2^1311611311 is an apocalyptic number.

1311611311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311611311 is an equidigital number, since it uses as much as digits as its factorization.

1311611311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 19.

The square root of 1311611311 is about 36216.1747151739. The cubic root of 1311611311 is about 1094.6326161312.

Adding to 1311611311 its reverse (1131161131), we get a palindrome (2442772442).

The spelling of 1311611311 in words is "one billion, three hundred eleven million, six hundred eleven thousand, three hundred eleven".