1323310721 has 2 divisors, whose sum is σ = 1323310722. Its totient is φ = 1323310720.

The previous prime is 1323310699. The next prime is 1323310739. The reversal of 1323310721 is 1270133231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1322340496 + 970225 = 36364^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323310721 - 2⁶ = 1323310657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1323312721) 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, 661655360 + 661655361.

It is an arithmetic number, because the mean of its divisors is an integer number (661655361).

Almost surely, 2^1323310721 is an apocalyptic number.

It is an amenable number.

1323310721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323310721 is an equidigital number, since it uses as much as digits as its factorization.

1323310721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 1323310721 is about 36377.3380142088. The cubic root of 1323310721 is about 1097.8776490709.

Adding to 1323310721 its reverse (1270133231), we get a palindrome (2593443952).

The spelling of 1323310721 in words is "one billion, three hundred twenty-three million, three hundred ten thousand, seven hundred twenty-one".