1329384691 has 4 divisors (see below), whose sum is σ = 1329457792. Its totient is φ = 1329311592.

The previous prime is 1329384673. The next prime is 1329384701. The reversal of 1329384691 is 1964839231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1964839231 = 37 ⋅53103763.

It is a cyclic number.

It is not a de Polignac number, because 1329384691 - 2⁹ = 1329384179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329388691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14446 + ... + 53548.

It is an arithmetic number, because the mean of its divisors is an integer number (332364448).

Almost surely, 2^1329384691 is an apocalyptic number.

1329384691 is a deficient number, since it is larger than the sum of its proper divisors (73101).

1329384691 is an equidigital number, since it uses as much as digits as its factorization.

1329384691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73100.

The product of its digits is 279936, while the sum is 46.

The square root of 1329384691 is about 36460.7280645903. The cubic root of 1329384691 is about 1099.5548311597.

The spelling of 1329384691 in words is "one billion, three hundred twenty-nine million, three hundred eighty-four thousand, six hundred ninety-one".