85855789 has 2 divisors, whose sum is σ = 85855790. Its totient is φ = 85855788.

The previous prime is 85855751. The next prime is 85855807. The reversal of 85855789 is 98755858.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65334889 + 20520900 = 8083^2 + 4530^2 .

It is a cyclic number.

It is not a de Polignac number, because 85855789 - 2¹⁹ = 85331501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85855489) 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, 42927894 + 42927895.

It is an arithmetic number, because the mean of its divisors is an integer number (42927895).

Almost surely, 2^85855789 is an apocalyptic number.

It is an amenable number.

85855789 is a deficient number, since it is larger than the sum of its proper divisors (1).

85855789 is an equidigital number, since it uses as much as digits as its factorization.

85855789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032000, while the sum is 55.

The square root of 85855789 is about 9265.8398971707. The cubic root of 85855789 is about 441.1536341494.

The spelling of 85855789 in words is "eighty-five million, eight hundred fifty-five thousand, seven hundred eighty-nine".