810256225 has 9 divisors (see below), whose sum is σ = 1004894233. Its totient is φ = 648091120.

The previous prime is 810256169. The next prime is 810256277. The reversal of 810256225 is 522652018.

The square root of 810256225 is 28465.

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

It can be written as a sum of positive squares in 4 ways, for example, as 235407649 + 574848576 = 15343^2 + 23976^2 .

It is not a de Polignac number, because 810256225 - 2¹⁷ = 810125153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 139479 + ... + 145171.

Almost surely, 2^810256225 is an apocalyptic number.

810256225 is the 28465-th square number.

810256225 is the 14233-rd centered octagonal number.

It is an amenable number.

810256225 is a deficient number, since it is larger than the sum of its proper divisors (194638008).

810256225 is an frugal number, since it uses more digits than its factorization.

810256225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11396 (or 5698 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The cubic root of 810256225 is about 932.2680316276.

The spelling of 810256225 in words is "eight hundred ten million, two hundred fifty-six thousand, two hundred twenty-five".