84285809 has 2 divisors, whose sum is σ = 84285810. Its totient is φ = 84285808.

The previous prime is 84285787. The next prime is 84285857. The reversal of 84285809 is 90858248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56670784 + 27615025 = 7528^2 + 5255^2 .

It is a cyclic number.

It is not a de Polignac number, because 84285809 - 2²⁴ = 67508593 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84285809.

It is not a weakly prime, because it can be changed into another prime (84245809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42142904 + 42142905.

It is an arithmetic number, because the mean of its divisors is an integer number (42142905).

Almost surely, 2^84285809 is an apocalyptic number.

It is an amenable number.

84285809 is a deficient number, since it is larger than the sum of its proper divisors (1).

84285809 is an equidigital number, since it uses as much as digits as its factorization.

84285809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 84285809 is about 9180.7303086410. The cubic root of 84285809 is about 438.4480604273.

The spelling of 84285809 in words is "eighty-four million, two hundred eighty-five thousand, eight hundred nine".