1305378920789 has 2 divisors, whose sum is σ = 1305378920790. Its totient is φ = 1305378920788.

The previous prime is 1305378920771. The next prime is 1305378920821. The reversal of 1305378920789 is 9870298735031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 949874398225 + 355504522564 = 974615^2 + 596242^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305378920789 - 2⁴⁰ = 205867293013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305378920719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652689460394 + 652689460395.

It is an arithmetic number, because the mean of its divisors is an integer number (652689460395).

Almost surely, 2^{1305378920789} is an apocalyptic number.

It is an amenable number.

1305378920789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305378920789 is an equidigital number, since it uses as much as digits as its factorization.

1305378920789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22861440, while the sum is 62.

The spelling of 1305378920789 in words is "one trillion, three hundred five billion, three hundred seventy-eight million, nine hundred twenty thousand, seven hundred eighty-nine".