1311323121 has 16 divisors (see below), whose sum is σ = 1947467200. Its totient is φ = 872070624.

The previous prime is 1311323113. The next prime is 1311323137. The reversal of 1311323121 is 1213231131.

It is not a de Polignac number, because 1311323121 - 2³ = 1311323113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311323094 and 1311323103.

It is not an unprimeable number, because it can be changed into a prime (1311322121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48331 + ... + 70416.

It is an arithmetic number, because the mean of its divisors is an integer number (121716700).

Almost surely, 2^1311323121 is an apocalyptic number.

It is an amenable number.

1311323121 is a deficient number, since it is larger than the sum of its proper divisors (636144079).

1311323121 is a wasteful number, since it uses less digits than its factorization.

1311323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119165 (or 119159 counting only the distinct ones).

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

The square root of 1311323121 is about 36212.1957494985. The cubic root of 1311323121 is about 1094.5524385973.

Adding to 1311323121 its reverse (1213231131), we get a palindrome (2524554252).

The spelling of 1311323121 in words is "one billion, three hundred eleven million, three hundred twenty-three thousand, one hundred twenty-one".