851085 has 12 divisors (see below), whose sum is σ = 1475292. Its totient is φ = 453888.

The previous prime is 851057. The next prime is 851087. The reversal of 851085 is 580158.

It can be written as a sum of positive squares in 2 ways, for example, as 617796 + 233289 = 786^2 + 483^2 .

It is not a de Polignac number, because 851085 - 2¹⁰ = 850061 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9412 + ... + 9501.

It is an arithmetic number, because the mean of its divisors is an integer number (122941).

2⁸⁵¹⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

851085 is a deficient number, since it is larger than the sum of its proper divisors (624207).

851085 is a wasteful number, since it uses less digits than its factorization.

851085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18924 (or 18921 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 851085 is about 922.5426819394. The cubic root of 851085 is about 94.7671119160.

The spelling of 851085 in words is "eight hundred fifty-one thousand, eighty-five".