851000 has 64 divisors (see below), whose sum is σ = 2134080. Its totient is φ = 316800.

The previous prime is 850979. The next prime is 851009. The reversal of 851000 is 158.

It is a nialpdrome in base 10.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851009) 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 in 15 ways as a sum of consecutive naturals, for example, 22982 + ... + 23018.

It is an arithmetic number, because the mean of its divisors is an integer number (33345).

2⁸⁵¹⁰⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1067040).

851000 is an abundant number, since it is smaller than the sum of its proper divisors (1283080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

851000 is a wasteful number, since it uses less digits than its factorization.

851000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 851000 is about 922.4966124599. The cubic root of 851000 is about 94.7639569344.

Adding to 851000 its reverse (158), we get a palindrome (851158).

The spelling of 851000 in words is "eight hundred fifty-one thousand".