1311321123 has 16 divisors (see below), whose sum is σ = 2220226560. Its totient is φ = 749326248.

The previous prime is 1311321091. The next prime is 1311321127. The reversal of 1311321123 is 3211231131.

It is not a de Polignac number, because 1311321123 - 2⁵ = 1311321091 is a prime.

It is a super-2 number, since 2×1311321123² = 3439126175251962258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311321096 and 1311321105.

It is not an unprimeable number, because it can be changed into a prime (1311321127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3468915 + ... + 3469292.

It is an arithmetic number, because the mean of its divisors is an integer number (138764160).

Almost surely, 2^1311321123 is an apocalyptic number.

1311321123 is a deficient number, since it is larger than the sum of its proper divisors (908905437).

1311321123 is an equidigital number, since it uses as much as digits as its factorization.

1311321123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6938223 (or 6938217 counting only the distinct ones).

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

The square root of 1311321123 is about 36212.1681620971. The cubic root of 1311321123 is about 1094.5518826914.

Adding to 1311321123 its reverse (3211231131), we get a palindrome (4522552254).

The spelling of 1311321123 in words is "one billion, three hundred eleven million, three hundred twenty-one thousand, one hundred twenty-three".