1320764647 has 2 divisors, whose sum is σ = 1320764648. Its totient is φ = 1320764646.

The previous prime is 1320764639. The next prime is 1320764681. The reversal of 1320764647 is 7464670231.

It is a weak prime.

It is an emirp because it is prime and its reverse (7464670231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320764647 - 2³ = 1320764639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320764747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660382323 + 660382324.

It is an arithmetic number, because the mean of its divisors is an integer number (660382324).

Almost surely, 2^1320764647 is an apocalyptic number.

1320764647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320764647 is an equidigital number, since it uses as much as digits as its factorization.

1320764647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 1320764647 is about 36342.3258336612. The cubic root of 1320764647 is about 1097.1730847955.

The spelling of 1320764647 in words is "one billion, three hundred twenty million, seven hundred sixty-four thousand, six hundred forty-seven".