1329473809 has 2 divisors, whose sum is σ = 1329473810. Its totient is φ = 1329473808.

The previous prime is 1329473801. The next prime is 1329473837. The reversal of 1329473809 is 9083749231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 732893184 + 596580625 = 27072^2 + 24425^2 .

It is an emirp because it is prime and its reverse (9083749231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1329473809 - 2³ = 1329473801 is a prime.

It is a super-4 number, since 4×1329473809⁴ (a number of 38 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (1329473801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664736904 + 664736905.

It is an arithmetic number, because the mean of its divisors is an integer number (664736905).

Almost surely, 2^1329473809 is an apocalyptic number.

It is an amenable number.

1329473809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1329473809 is an equidigital number, since it uses as much as digits as its factorization.

1329473809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 1329473809 is about 36461.9501535505. The cubic root of 1329473809 is about 1099.5794009070.

The spelling of 1329473809 in words is "one billion, three hundred twenty-nine million, four hundred seventy-three thousand, eight hundred nine".