1321307929789 has 2 divisors, whose sum is σ = 1321307929790. Its totient is φ = 1321307929788.

The previous prime is 1321307929729. The next prime is 1321307929801. The reversal of 1321307929789 is 9879297031231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1128162622500 + 193145307289 = 1062150^2 + 439483^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321307929789 - 2⁷ = 1321307929661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321307929729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660653964894 + 660653964895.

It is an arithmetic number, because the mean of its divisors is an integer number (660653964895).

Almost surely, 2^{1321307929789} is an apocalyptic number.

It is an amenable number.

1321307929789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321307929789 is an equidigital number, since it uses as much as digits as its factorization.

1321307929789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 61.

The spelling of 1321307929789 in words is "one trillion, three hundred twenty-one billion, three hundred seven million, nine hundred twenty-nine thousand, seven hundred eighty-nine".