1326323809 has 4 divisors (see below), whose sum is σ = 1369108480. Its totient is φ = 1283539140.

The previous prime is 1326323797. The next prime is 1326323813. The reversal of 1326323809 is 9083236231.

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: 9083236231 = 27281 ⋅332951.

It is a cyclic number.

It is not a de Polignac number, because 1326323809 - 2¹⁵ = 1326291041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1326323839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21392289 + ... + 21392350.

It is an arithmetic number, because the mean of its divisors is an integer number (342277120).

Almost surely, 2^1326323809 is an apocalyptic number.

It is an amenable number.

1326323809 is a deficient number, since it is larger than the sum of its proper divisors (42784671).

1326323809 is an equidigital number, since it uses as much as digits as its factorization.

1326323809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42784670.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 1326323809 is about 36418.7288218576. The cubic root of 1326323809 is about 1098.7102815460.

The spelling of 1326323809 in words is "one billion, three hundred twenty-six million, three hundred twenty-three thousand, eight hundred nine".