1329350809 has 4 divisors (see below), whose sum is σ = 1329884416. Its totient is φ = 1328817204.

The previous prime is 1329350801. The next prime is 1329350843. The reversal of 1329350809 is 9080539231.

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 an emirpimes, since its reverse is a distinct semiprime: 9080539231 = 577 ⋅15737503.

It is a cyclic number.

It is not a de Polignac number, because 1329350809 - 2³ = 1329350801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329350801) 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, 263049 + ... + 268054.

It is an arithmetic number, because the mean of its divisors is an integer number (332471104).

Almost surely, 2^1329350809 is an apocalyptic number.

It is an amenable number.

1329350809 is a deficient number, since it is larger than the sum of its proper divisors (533607).

1329350809 is an equidigital number, since it uses as much as digits as its factorization.

1329350809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533606.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 1329350809 is about 36460.2634247203. The cubic root of 1329350809 is about 1099.5454896366.

The spelling of 1329350809 in words is "one billion, three hundred twenty-nine million, three hundred fifty thousand, eight hundred nine".