851587172 has 18 divisors (see below), whose sum is σ = 1522676022. Its totient is φ = 416729824.

The previous prime is 851587151. The next prime is 851587181. The reversal of 851587172 is 271785158.

It can be written as a sum of positive squares in only one way, i.e., 800550436 + 51036736 = 28294^2 + 7144^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 39353 + ... + 57024.

Almost surely, 2^851587172 is an apocalyptic number.

It is an amenable number.

851587172 is a deficient number, since it is larger than the sum of its proper divisors (671088850).

851587172 is a wasteful number, since it uses less digits than its factorization.

851587172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96475 (or 96426 counting only the distinct ones).

The product of its digits is 156800, while the sum is 44.

The square root of 851587172 is about 29181.9665547064. The cubic root of 851587172 is about 947.8574696553.

The spelling of 851587172 in words is "eight hundred fifty-one million, five hundred eighty-seven thousand, one hundred seventy-two".