1305028805509 has 24 divisors (see below), whose sum is σ = 1544974032896. Its totient is φ = 1095002647200.

The previous prime is 1305028805453. The next prime is 1305028805603. The reversal of 1305028805509 is 9055088205031.

It is not a de Polignac number, because 1305028805509 - 2¹¹ = 1305028803461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305028805009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15106492 + ... + 15192634.

Almost surely, 2^{1305028805509} is an apocalyptic number.

It is an amenable number.

1305028805509 is a deficient number, since it is larger than the sum of its proper divisors (239945227387).

1305028805509 is a wasteful number, since it uses less digits than its factorization.

1305028805509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95809 (or 95798 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 1305028805509 in words is "one trillion, three hundred five billion, twenty-eight million, eight hundred five thousand, five hundred nine".