1321905323 has 2 divisors, whose sum is σ = 1321905324. Its totient is φ = 1321905322.

The previous prime is 1321905311. The next prime is 1321905331. The reversal of 1321905323 is 3235091231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321905323 - 2¹⁶ = 1321839787 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321905353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660952661 + 660952662.

It is an arithmetic number, because the mean of its divisors is an integer number (660952662).

Almost surely, 2^1321905323 is an apocalyptic number.

1321905323 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321905323 is an equidigital number, since it uses as much as digits as its factorization.

1321905323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 1321905323 is about 36358.0159387170. The cubic root of 1321905323 is about 1097.4888510931.

Adding to 1321905323 its reverse (3235091231), we get a palindrome (4556996554).

The spelling of 1321905323 in words is "one billion, three hundred twenty-one million, nine hundred five thousand, three hundred twenty-three".