1811111211311 has 2 divisors, whose sum is σ = 1811111211312. Its totient is φ = 1811111211310.

The previous prime is 1811111211293. The next prime is 1811111211359. The reversal of 1811111211311 is 1131121111181.

It is a m-pointer prime, because the next prime (1811111211359) can be obtained adding 1811111211311 to its product of digits (48).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1811111211311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1811111211391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905555605655 + 905555605656.

It is an arithmetic number, because the mean of its divisors is an integer number (905555605656).

Almost surely, 2^{1811111211311} is an apocalyptic number.

1811111211311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811111211311 is an equidigital number, since it uses as much as digits as its factorization.

1811111211311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 23.

Adding to 1811111211311 its reverse (1131121111181), we get a palindrome (2942232322492).

The spelling of 1811111211311 in words is "one trillion, eight hundred eleven billion, one hundred eleven million, two hundred eleven thousand, three hundred eleven".