1327643521 has 2 divisors, whose sum is σ = 1327643522. Its totient is φ = 1327643520.

The previous prime is 1327643501. The next prime is 1327643531. The reversal of 1327643521 is 1253467231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1192735296 + 134908225 = 34536^2 + 11615^2 .

It is an emirp because it is prime and its reverse (1253467231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1327643521 - 2⁵ = 1327643489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1327643501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663821760 + 663821761.

It is an arithmetic number, because the mean of its divisors is an integer number (663821761).

Almost surely, 2^1327643521 is an apocalyptic number.

It is an amenable number.

1327643521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1327643521 is an equidigital number, since it uses as much as digits as its factorization.

1327643521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 34.

The square root of 1327643521 is about 36436.8429065966. The cubic root of 1327643521 is about 1099.0745717948.

The spelling of 1327643521 in words is "one billion, three hundred twenty-seven million, six hundred forty-three thousand, five hundred twenty-one".