851550 has 48 divisors (see below), whose sum is σ = 2416512. Its totient is φ = 194400.

The previous prime is 851549. The next prime is 851569. The reversal of 851550 is 55158.

It is a self number, because there is not a number n which added to its sum of digits gives 851550.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 851550.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 645 + ... + 1455.

It is an arithmetic number, because the mean of its divisors is an integer number (50344).

2⁸⁵¹⁵⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1208256).

851550 is an abundant number, since it is smaller than the sum of its proper divisors (1564962).

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

851550 is a wasteful number, since it uses less digits than its factorization.

851550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 851550 is about 922.7946683851. The cubic root of 851550 is about 94.7843678047.

The spelling of 851550 in words is "eight hundred fifty-one thousand, five hundred fifty".