1028509304621 has 4 divisors (see below), whose sum is σ = 1029701089152. Its totient is φ = 1027317520092.

The previous prime is 1028509304611. The next prime is 1028509304629. The reversal of 1028509304621 is 1264039058201.

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 1028509304621 - 2¹⁰ = 1028509303597 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 (1028509304629) 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, 595890971 + ... + 595892696.

It is an arithmetic number, because the mean of its divisors is an integer number (257425272288).

Almost surely, 2^{1028509304621} is an apocalyptic number.

It is an amenable number.

1028509304621 is a deficient number, since it is larger than the sum of its proper divisors (1191784531).

1028509304621 is an equidigital number, since it uses as much as digits as its factorization.

1028509304621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191784530.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 1028509304621 in words is "one trillion, twenty-eight billion, five hundred nine million, three hundred four thousand, six hundred twenty-one".