1311323331 has 4 divisors (see below), whose sum is σ = 1748431112. Its totient is φ = 874215552.

The previous prime is 1311323329. The next prime is 1311323371. The reversal of 1311323331 is 1333231131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1311323331 - 2¹ = 1311323329 is a prime.

It is a super-2 number, since 2×1311323331² = 3439137756849871122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311323298 and 1311323307.

It is not an unprimeable number, because it can be changed into a prime (1311323371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218553886 + ... + 218553891.

It is an arithmetic number, because the mean of its divisors is an integer number (437107778).

Almost surely, 2^1311323331 is an apocalyptic number.

1311323331 is a deficient number, since it is larger than the sum of its proper divisors (437107781).

1311323331 is an equidigital number, since it uses as much as digits as its factorization.

1311323331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437107780.

The product of its digits is 486, while the sum is 21.

The square root of 1311323331 is about 36212.1986490740. The cubic root of 1311323331 is about 1094.5524970258.

Adding to 1311323331 its reverse (1333231131), we get a palindrome (2644554462).

The spelling of 1311323331 in words is "one billion, three hundred eleven million, three hundred twenty-three thousand, three hundred thirty-one".