851764225 has 27 divisors (see below), whose sum is σ = 1146235323. Its totient is φ = 627594240.

The previous prime is 851764211. The next prime is 851764229. The reversal of 851764225 is 522467158.

The square root of 851764225 is 29185.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 743271169 + 108493056 = 27263^2 + 10416^2 .

It is not a de Polignac number, because 851764225 - 2¹⁹ = 851239937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851764229) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 1896801 + ... + 1897249.

Almost surely, 2^851764225 is an apocalyptic number.

851764225 is the 29185-th square number.

851764225 is the 14593-rd centered octagonal number.

It is an amenable number.

851764225 is a deficient number, since it is larger than the sum of its proper divisors (294471098).

851764225 is an equidigital number, since it uses as much as digits as its factorization.

851764225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934 (or 467 counting only the distinct ones).

The product of its digits is 134400, while the sum is 40.

The cubic root of 851764225 is about 947.9231546041.

It can be divided in two parts, 85176 and 4225, that added together give a square (89401 = 299²).

The spelling of 851764225 in words is "eight hundred fifty-one million, seven hundred sixty-four thousand, two hundred twenty-five".