1305605039989 has 2 divisors, whose sum is σ = 1305605039990. Its totient is φ = 1305605039988.

The previous prime is 1305605039969. The next prime is 1305605040023. The reversal of 1305605039989 is 9899305065031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 710593363089 + 595011676900 = 842967^2 + 771370^2 .

It is an emirp because it is prime and its reverse (9899305065031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1305605039989 - 2¹¹ = 1305605037941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305605039969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652802519994 + 652802519995.

It is an arithmetic number, because the mean of its divisors is an integer number (652802519995).

Almost surely, 2^{1305605039989} is an apocalyptic number.

It is an amenable number.

1305605039989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305605039989 is an equidigital number, since it uses as much as digits as its factorization.

1305605039989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7873200, while the sum is 58.

The spelling of 1305605039989 in words is "one trillion, three hundred five billion, six hundred five million, thirty-nine thousand, nine hundred eighty-nine".