821341289 has 2 divisors, whose sum is σ = 821341290. Its totient is φ = 821341288.

The previous prime is 821341259. The next prime is 821341303. The reversal of 821341289 is 982143128.

821341289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 797497600 + 23843689 = 28240^2 + 4883^2 .

It is a cyclic number.

It is not a de Polignac number, because 821341289 - 2⁸ = 821341033 is a prime.

It is not a weakly prime, because it can be changed into another prime (821341259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410670644 + 410670645.

It is an arithmetic number, because the mean of its divisors is an integer number (410670645).

Almost surely, 2^821341289 is an apocalyptic number.

It is an amenable number.

821341289 is a deficient number, since it is larger than the sum of its proper divisors (1).

821341289 is an equidigital number, since it uses as much as digits as its factorization.

821341289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 821341289 is about 28659.0524791034. The cubic root of 821341289 is about 936.5002230533.

The spelling of 821341289 in words is "eight hundred twenty-one million, three hundred forty-one thousand, two hundred eighty-nine".