85840889 has 2 divisors, whose sum is σ = 85840890. Its totient is φ = 85840888.

The previous prime is 85840883. The next prime is 85840907. The reversal of 85840889 is 98804858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83539600 + 2301289 = 9140^2 + 1517^2 .

It is a cyclic number.

It is not a de Polignac number, because 85840889 - 2²⁰ = 84792313 is a prime.

It is a Chen prime.

It is equal to p_4989776 and since 85840889 and 4989776 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (85840883) 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, 42920444 + 42920445.

It is an arithmetic number, because the mean of its divisors is an integer number (42920445).

Almost surely, 2^85840889 is an apocalyptic number.

It is an amenable number.

85840889 is a deficient number, since it is larger than the sum of its proper divisors (1).

85840889 is an equidigital number, since it uses as much as digits as its factorization.

85840889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 737280, while the sum is 50.

The square root of 85840889 is about 9265.0358337138. The cubic root of 85840889 is about 441.1281124013.

The spelling of 85840889 in words is "eighty-five million, eight hundred forty thousand, eight hundred eighty-nine".