821849359 has 2 divisors, whose sum is σ = 821849360. Its totient is φ = 821849358.

The previous prime is 821849341. The next prime is 821849383. The reversal of 821849359 is 953948128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821849359 - 2¹⁵ = 821816591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821849159) 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, 410924679 + 410924680.

It is an arithmetic number, because the mean of its divisors is an integer number (410924680).

Almost surely, 2^821849359 is an apocalyptic number.

821849359 is a deficient number, since it is larger than the sum of its proper divisors (1).

821849359 is an equidigital number, since it uses as much as digits as its factorization.

821849359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 49.

The square root of 821849359 is about 28667.9151491698. The cubic root of 821849359 is about 936.6932851414.

The spelling of 821849359 in words is "eight hundred twenty-one million, eight hundred forty-nine thousand, three hundred fifty-nine".