1328635309 has 2 divisors, whose sum is σ = 1328635310. Its totient is φ = 1328635308.

The previous prime is 1328635307. The next prime is 1328635333. The reversal of 1328635309 is 9035368231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 697118409 + 631516900 = 26403^2 + 25130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328635309 - 2¹ = 1328635307 is a prime.

Together with 1328635307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328635307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664317654 + 664317655.

It is an arithmetic number, because the mean of its divisors is an integer number (664317655).

Almost surely, 2^1328635309 is an apocalyptic number.

It is an amenable number.

1328635309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328635309 is an equidigital number, since it uses as much as digits as its factorization.

1328635309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 1328635309 is about 36450.4500520913. The cubic root of 1328635309 is about 1099.3481838084.

The spelling of 1328635309 in words is "one billion, three hundred twenty-eight million, six hundred thirty-five thousand, three hundred nine".