1328861 has 2 divisors, whose sum is σ = 1328862. Its totient is φ = 1328860.

The previous prime is 1328843. The next prime is 1328863. The reversal of 1328861 is 1688231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1223236 + 105625 = 1106^2 + 325^2 .

It is an emirp because it is prime and its reverse (1688231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1328861 - 2⁶ = 1328797 is a prime.

Together with 1328863, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328863) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664430 + 664431.

It is an arithmetic number, because the mean of its divisors is an integer number (664431).

2^1328861 is an apocalyptic number.

It is an amenable number.

1328861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328861 is an equidigital number, since it uses as much as digits as its factorization.

1328861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 1328861 is about 1152.7623345686. The cubic root of 1328861 is about 109.9410427862.

The spelling of 1328861 in words is "one million, three hundred twenty-eight thousand, eight hundred sixty-one".