820449011 has 2 divisors, whose sum is σ = 820449012. Its totient is φ = 820449010.

The previous prime is 820449001. The next prime is 820449037. The reversal of 820449011 is 110944028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820449011 - 2¹⁸ = 820186867 is a prime.

It is not a weakly prime, because it can be changed into another prime (820449001) 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, 410224505 + 410224506.

It is an arithmetic number, because the mean of its divisors is an integer number (410224506).

Almost surely, 2^820449011 is an apocalyptic number.

820449011 is a deficient number, since it is larger than the sum of its proper divisors (1).

820449011 is an equidigital number, since it uses as much as digits as its factorization.

820449011 is an odious number, because the sum of its binary digits is odd.

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

The square root of 820449011 is about 28643.4811257291. The cubic root of 820449011 is about 936.1609725549.

The spelling of 820449011 in words is "eight hundred twenty million, four hundred forty-nine thousand, eleven".