1327389691 has 2 divisors, whose sum is σ = 1327389692. Its totient is φ = 1327389690.

The previous prime is 1327389673. The next prime is 1327389703. The reversal of 1327389691 is 1969837231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1327389691 - 2¹³ = 1327381499 is a prime.

It is not a weakly prime, because it can be changed into another prime (1327389491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663694845 + 663694846.

It is an arithmetic number, because the mean of its divisors is an integer number (663694846).

Almost surely, 2^1327389691 is an apocalyptic number.

1327389691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1327389691 is an equidigital number, since it uses as much as digits as its factorization.

1327389691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 1327389691 is about 36433.3595898045. The cubic root of 1327389691 is about 1099.0045239054.

The spelling of 1327389691 in words is "one billion, three hundred twenty-seven million, three hundred eighty-nine thousand, six hundred ninety-one".