851243172 has 48 divisors (see below), whose sum is σ = 2153246592. Its totient is φ = 260179200.

The previous prime is 851243137. The next prime is 851243207. The reversal of 851243172 is 271342158.

851243172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (851243137) and next prime (851243207).

It is a super-2 number, since 2×851243172² = 1449229875753243168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5488 + ... + 41624.

It is an arithmetic number, because the mean of its divisors is an integer number (44859304).

Almost surely, 2^851243172 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 851243172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1076623296).

851243172 is an abundant number, since it is smaller than the sum of its proper divisors (1302003420).

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

851243172 is a wasteful number, since it uses less digits than its factorization.

851243172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36308 (or 36306 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 851243172 is about 29176.0719083293. The cubic root of 851243172 is about 947.7298229525.

The spelling of 851243172 in words is "eight hundred fifty-one million, two hundred forty-three thousand, one hundred seventy-two".