1329686647 has 2 divisors, whose sum is σ = 1329686648. Its totient is φ = 1329686646.

The previous prime is 1329686609. The next prime is 1329686653. The reversal of 1329686647 is 7466869231.

It is a strong prime.

It is an emirp because it is prime and its reverse (7466869231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1329686647 - 2²⁷ = 1195468919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1329686594 and 1329686603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1329686947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664843323 + 664843324.

It is an arithmetic number, because the mean of its divisors is an integer number (664843324).

Almost surely, 2^1329686647 is an apocalyptic number.

1329686647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1329686647 is an equidigital number, since it uses as much as digits as its factorization.

1329686647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 52.

The square root of 1329686647 is about 36464.8686683498. The cubic root of 1329686647 is about 1099.6380756978.

The spelling of 1329686647 in words is "one billion, three hundred twenty-nine million, six hundred eighty-six thousand, six hundred forty-seven".