84025838209 has 2 divisors, whose sum is σ = 84025838210. Its totient is φ = 84025838208.

The previous prime is 84025838201. The next prime is 84025838227. The reversal of 84025838209 is 90283852048.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83927828209 + 98010000 = 289703^2 + 9900^2 .

It is a cyclic number.

It is not a de Polignac number, because 84025838209 - 2³ = 84025838201 is a prime.

It is a super-3 number, since 3×84025838209³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (84025838201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42012919104 + 42012919105.

It is an arithmetic number, because the mean of its divisors is an integer number (42012919105).

Almost surely, 2^84025838209 is an apocalyptic number.

It is an amenable number.

84025838209 is a deficient number, since it is larger than the sum of its proper divisors (1).

84025838209 is an equidigital number, since it uses as much as digits as its factorization.

84025838209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 84025838209 in words is "eighty-four billion, twenty-five million, eight hundred thirty-eight thousand, two hundred nine".