851228885 has 16 divisors (see below), whose sum is σ = 1100793456. Its totient is φ = 628174848.

The previous prime is 851228881. The next prime is 851228897. The reversal of 851228885 is 588822158.

It can be written as a sum of positive squares in 8 ways, for example, as 108284836 + 742944049 = 10406^2 + 27257^2 .

It is a cyclic number.

It is not a de Polignac number, because 851228885 - 2² = 851228881 is a prime.

It is a super-2 number, since 2×851228885² = 1449181229316686450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851228881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118517 + ... + 125493.

It is an arithmetic number, because the mean of its divisors is an integer number (68799591).

Almost surely, 2^851228885 is an apocalyptic number.

It is an amenable number.

851228885 is a deficient number, since it is larger than the sum of its proper divisors (249564571).

851228885 is a wasteful number, since it uses less digits than its factorization.

851228885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8872.

The product of its digits is 409600, while the sum is 47.

The square root of 851228885 is about 29175.8270662547. The cubic root of 851228885 is about 947.7245207889.

The spelling of 851228885 in words is "eight hundred fifty-one million, two hundred twenty-eight thousand, eight hundred eighty-five".