1329312809 has 4 divisors (see below), whose sum is σ = 1450159440. Its totient is φ = 1208466180.

The previous prime is 1329312791. The next prime is 1329312821. The reversal of 1329312809 is 9082139231.

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 1329312809 - 2¹⁶ = 1329247273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329312869) 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, 60423299 + ... + 60423320.

It is an arithmetic number, because the mean of its divisors is an integer number (362539860).

Almost surely, 2^1329312809 is an apocalyptic number.

It is an amenable number.

1329312809 is a deficient number, since it is larger than the sum of its proper divisors (120846631).

1329312809 is a wasteful number, since it uses less digits than its factorization.

1329312809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120846630.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1329312809 is about 36459.7423057267. The cubic root of 1329312809 is about 1099.5350125610.

The spelling of 1329312809 in words is "one billion, three hundred twenty-nine million, three hundred twelve thousand, eight hundred nine".