1028509304809 has 4 divisors (see below), whose sum is σ = 1175439205504. Its totient is φ = 881579404116.

The previous prime is 1028509304791. The next prime is 1028509304833. The reversal of 1028509304809 is 9084039058201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1028509304809 - 2⁷ = 1028509304681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028509304869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73464950337 + ... + 73464950350.

It is an arithmetic number, because the mean of its divisors is an integer number (293859801376).

Almost surely, 2^{1028509304809} is an apocalyptic number.

It is an amenable number.

1028509304809 is a deficient number, since it is larger than the sum of its proper divisors (146929900695).

1028509304809 is an equidigital number, since it uses as much as digits as its factorization.

1028509304809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146929900694.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 1028509304809 in words is "one trillion, twenty-eight billion, five hundred nine million, three hundred four thousand, eight hundred nine".