1311231123 has 12 divisors (see below), whose sum is σ = 1945190208. Its totient is φ = 850528080.

The previous prime is 1311231083. The next prime is 1311231167. The reversal of 1311231123 is 3211321131.

1311231123 is a `hidden beast` number, since 1 + 311 + 231 + 123 = 666.

It is not a de Polignac number, because 1311231123 - 2⁹ = 1311230611 is a prime.

It is a super-2 number, since 2×1311231123² = 3438654115847682258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311231096 and 1311231105.

It is not an unprimeable number, because it can be changed into a prime (1311231193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1968483 + ... + 1969148.

It is an arithmetic number, because the mean of its divisors is an integer number (162099184).

Almost surely, 2^1311231123 is an apocalyptic number.

1311231123 is a deficient number, since it is larger than the sum of its proper divisors (633959085).

1311231123 is a wasteful number, since it uses less digits than its factorization.

1311231123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937674 (or 3937671 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1311231123 is about 36210.9254645611. The cubic root of 1311231123 is about 1094.5268412982.

Adding to 1311231123 its reverse (3211321131), we get a palindrome (4522552254).

The spelling of 1311231123 in words is "one billion, three hundred eleven million, two hundred thirty-one thousand, one hundred twenty-three".