820550069 has 2 divisors, whose sum is σ = 820550070. Its totient is φ = 820550068.

The previous prime is 820550051. The next prime is 820550077. The reversal of 820550069 is 960055028.

820550069 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., 443607844 + 376942225 = 21062^2 + 19415^2 .

It is a cyclic number.

It is not a de Polignac number, because 820550069 - 2²⁸ = 552114613 is a prime.

It is a super-2 number, since 2×820550069² = 1346604831471809522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820550009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410275034 + 410275035.

It is an arithmetic number, because the mean of its divisors is an integer number (410275035).

Almost surely, 2^820550069 is an apocalyptic number.

It is an amenable number.

820550069 is a deficient number, since it is larger than the sum of its proper divisors (1).

820550069 is an equidigital number, since it uses as much as digits as its factorization.

820550069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 820550069 is about 28645.2451377188. The cubic root of 820550069 is about 936.1994078793.

The spelling of 820550069 in words is "eight hundred twenty million, five hundred fifty thousand, sixty-nine".