1231122311311 has 4 divisors (see below), whose sum is σ = 1235472567112. Its totient is φ = 1226772055512.

The previous prime is 1231122311303. The next prime is 1231122311323. The reversal of 1231122311311 is 1131132211321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1231122311311 - 2³ = 1231122311303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231122311011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2175127476 + ... + 2175128041.

It is an arithmetic number, because the mean of its divisors is an integer number (308868141778).

Almost surely, 2^{1231122311311} is an apocalyptic number.

1231122311311 is a deficient number, since it is larger than the sum of its proper divisors (4350255801).

1231122311311 is an equidigital number, since it uses as much as digits as its factorization.

1231122311311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350255800.

The product of its digits is 216, while the sum is 22.

Adding to 1231122311311 its reverse (1131132211321), we get a palindrome (2362254522632).

The spelling of 1231122311311 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-two million, three hundred eleven thousand, three hundred eleven".