1320871 has 2 divisors, whose sum is σ = 1320872. Its totient is φ = 1320870.

The previous prime is 1320859. The next prime is 1320881. The reversal of 1320871 is 1780231.

It is a strong prime.

It is an emirp because it is prime and its reverse (1780231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320871 - 2¹⁵ = 1288103 is a prime.

1320871 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660435 + 660436.

It is an arithmetic number, because the mean of its divisors is an integer number (660436).

2^1320871 is an apocalyptic number.

1320871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320871 is an equidigital number, since it uses as much as digits as its factorization.

1320871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1320871 is about 1149.2915208945. The cubic root of 1320871 is about 109.7202533524.

The spelling of 1320871 in words is "one million, three hundred twenty thousand, eight hundred seventy-one".