851571252 has 96 divisors (see below), whose sum is σ = 2529273600. Its totient is φ = 242718336.

The previous prime is 851571229. The next prime is 851571263. The reversal of 851571252 is 252175158.

851571252 is a `hidden beast` number, since 85 + 1 + 571 + 2 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 383698 + ... + 385910.

It is an arithmetic number, because the mean of its divisors is an integer number (26346600).

Almost surely, 2^851571252 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 851571252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1264636800).

851571252 is an abundant number, since it is smaller than the sum of its proper divisors (1677702348).

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

851571252 is a wasteful number, since it uses less digits than its factorization.

851571252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742 (or 2734 counting only the distinct ones).

The product of its digits is 28000, while the sum is 36.

The square root of 851571252 is about 29181.6937822327. The cubic root of 851571252 is about 947.8515630433.

The spelling of 851571252 in words is "eight hundred fifty-one million, five hundred seventy-one thousand, two hundred fifty-two".