1311023321 has 2 divisors, whose sum is σ = 1311023322. Its totient is φ = 1311023320.

The previous prime is 1311023309. The next prime is 1311023327. The reversal of 1311023321 is 1233201131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1300395721 + 10627600 = 36061^2 + 3260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311023321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311023321.

It is not a weakly prime, because it can be changed into another prime (1311023327) 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 as a sum of consecutive naturals, namely, 655511660 + 655511661.

It is an arithmetic number, because the mean of its divisors is an integer number (655511661).

Almost surely, 2^1311023321 is an apocalyptic number.

It is an amenable number.

1311023321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311023321 is an equidigital number, since it uses as much as digits as its factorization.

1311023321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1311023321 is about 36208.0560234874. The cubic root of 1311023321 is about 1094.4690185700.

Adding to 1311023321 its reverse (1233201131), we get a palindrome (2544224452).

The spelling of 1311023321 in words is "one billion, three hundred eleven million, twenty-three thousand, three hundred twenty-one".