1123123111131 has 12 divisors (see below), whose sum is σ = 1741986866472. Its totient is φ = 641784634848.

The previous prime is 1123123111027. The next prime is 1123123111157. The reversal of 1123123111131 is 1311113213211.

It is not a de Polignac number, because 1123123111131 - 2¹⁰ = 1123123110107 is a prime.

It is a super-2 number, since 2×1123123111131² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1123123111098 and 1123123111107.

It is not an unprimeable number, because it can be changed into a prime (1123123151131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3820146490 + ... + 3820146783.

It is an arithmetic number, because the mean of its divisors is an integer number (145165572206).

Almost surely, 2^{1123123111131} is an apocalyptic number.

1123123111131 is a deficient number, since it is larger than the sum of its proper divisors (618863755341).

1123123111131 is an equidigital number, since it uses as much as digits as its factorization.

1123123111131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7640293290 (or 7640293283 counting only the distinct ones).

The product of its digits is 108, while the sum is 21.

Adding to 1123123111131 its reverse (1311113213211), we get a palindrome (2434236324342).

The spelling of 1123123111131 in words is "one trillion, one hundred twenty-three billion, one hundred twenty-three million, one hundred eleven thousand, one hundred thirty-one".