1311231223111 has 4 divisors (see below), whose sum is σ = 1314654803712. Its totient is φ = 1307807642512.

The previous prime is 1311231223087. The next prime is 1311231223139. The reversal of 1311231223111 is 1113221321131.

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 1311231223111 - 2¹³ = 1311231214919 is a prime.

It is a super-2 number, since 2×1311231223111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311231224111) 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, 1711789726 + ... + 1711790491.

It is an arithmetic number, because the mean of its divisors is an integer number (328663700928).

Almost surely, 2^{1311231223111} is an apocalyptic number.

1311231223111 is a deficient number, since it is larger than the sum of its proper divisors (3423580601).

1311231223111 is an equidigital number, since it uses as much as digits as its factorization.

1311231223111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423580600.

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

Adding to 1311231223111 its reverse (1113221321131), we get a palindrome (2424452544242).

The spelling of 1311231223111 in words is "one trillion, three hundred eleven billion, two hundred thirty-one million, two hundred twenty-three thousand, one hundred eleven".