1328268209 has 4 divisors (see below), whose sum is σ = 1328341104. Its totient is φ = 1328195316.

The previous prime is 1328268181. The next prime is 1328268241. The reversal of 1328268209 is 9028628231.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1328268209 - 2²⁰ = 1327219633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328268509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17714 + ... + 54500.

It is an arithmetic number, because the mean of its divisors is an integer number (332085276).

Almost surely, 2^1328268209 is an apocalyptic number.

It is an amenable number.

1328268209 is a deficient number, since it is larger than the sum of its proper divisors (72895).

1328268209 is an equidigital number, since it uses as much as digits as its factorization.

1328268209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72894.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 1328268209 is about 36445.4141010910. The cubic root of 1328268209 is about 1099.2469250482.

The spelling of 1328268209 in words is "one billion, three hundred twenty-eight million, two hundred sixty-eight thousand, two hundred nine".