1123123231311 has 32 divisors (see below), whose sum is σ = 1540370219520. Its totient is φ = 727657257600.

The previous prime is 1123123231303. The next prime is 1123123231339. The reversal of 1123123231311 is 1131323213211.

It is not a de Polignac number, because 1123123231311 - 2³ = 1123123231303 is a prime.

It is a super-2 number, since 2×1123123231311² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123123231511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5387526 + ... + 5592108.

It is an arithmetic number, because the mean of its divisors is an integer number (48136569360).

Almost surely, 2^{1123123231311} is an apocalyptic number.

1123123231311 is a deficient number, since it is larger than the sum of its proper divisors (417246988209).

1123123231311 is a wasteful number, since it uses less digits than its factorization.

1123123231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205007.

The product of its digits is 648, while the sum is 24.

Adding to 1123123231311 its reverse (1131323213211), we get a palindrome (2254446444522).

The spelling of 1123123231311 in words is "one trillion, one hundred twenty-three billion, one hundred twenty-three million, two hundred thirty-one thousand, three hundred eleven".