820082891 has 2 divisors, whose sum is σ = 820082892. Its totient is φ = 820082890.

The previous prime is 820082867. The next prime is 820082947. The reversal of 820082891 is 198280028.

820082891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820082891 is a prime.

It is a super-2 number, since 2×820082891² = 1345071896221835762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (820082591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410041445 + 410041446.

It is an arithmetic number, because the mean of its divisors is an integer number (410041446).

Almost surely, 2^820082891 is an apocalyptic number.

820082891 is a deficient number, since it is larger than the sum of its proper divisors (1).

820082891 is an equidigital number, since it uses as much as digits as its factorization.

820082891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 820082891 is about 28637.0894296191. The cubic root of 820082891 is about 936.0216999346.

The spelling of 820082891 in words is "eight hundred twenty million, eighty-two thousand, eight hundred ninety-one".