820866103 has 2 divisors, whose sum is σ = 820866104. Its totient is φ = 820866102.

The previous prime is 820866077. The next prime is 820866119. The reversal of 820866103 is 301668028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820866103 - 2⁵ = 820866071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820864103) 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, 410433051 + 410433052.

It is an arithmetic number, because the mean of its divisors is an integer number (410433052).

Almost surely, 2^820866103 is an apocalyptic number.

820866103 is a deficient number, since it is larger than the sum of its proper divisors (1).

820866103 is an equidigital number, since it uses as much as digits as its factorization.

820866103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 820866103 is about 28650.7609497549. The cubic root of 820866103 is about 936.3195845259.

The spelling of 820866103 in words is "eight hundred twenty million, eight hundred sixty-six thousand, one hundred three".