855859189 has 2 divisors, whose sum is σ = 855859190. Its totient is φ = 855859188.

The previous prime is 855859183. The next prime is 855859201. The reversal of 855859189 is 981958558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 465480625 + 390378564 = 21575^2 + 19758^2 .

It is a cyclic number.

It is not a de Polignac number, because 855859189 - 2³ = 855859181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855859181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427929594 + 427929595.

It is an arithmetic number, because the mean of its divisors is an integer number (427929595).

Almost surely, 2^855859189 is an apocalyptic number.

It is an amenable number.

855859189 is a deficient number, since it is larger than the sum of its proper divisors (1).

855859189 is an equidigital number, since it uses as much as digits as its factorization.

855859189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184000, while the sum is 58.

The square root of 855859189 is about 29255.0711672353. The cubic root of 855859189 is about 949.4398134146.

The spelling of 855859189 in words is "eight hundred fifty-five million, eight hundred fifty-nine thousand, one hundred eighty-nine".