811225 has 12 divisors (see below), whose sum is σ = 1034284. Its totient is φ = 630720.

The previous prime is 811207. The next prime is 811231. The reversal of 811225 is 522118.

811225 = 66² + 67² + ... + 139².

It can be written as a sum of positive squares in 6 ways, for example, as 59536 + 751689 = 244^2 + 867^2 .

It is not a de Polignac number, because 811225 - 2⁵ = 811193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 487 + ... + 1363.

2⁸¹¹²²⁵ is an apocalyptic number.

It is an amenable number.

811225 is a deficient number, since it is larger than the sum of its proper divisors (223059).

811225 is a wasteful number, since it uses less digits than its factorization.

811225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924 (or 919 counting only the distinct ones).

The product of its digits is 160, while the sum is 19.

The square root of 811225 is about 900.6802984411. The cubic root of 811225 is about 93.2639436056.

It can be divided in two parts, 81 and 1225, that multiplied together give a square (99225 = 315²).

The spelling of 811225 in words is "eight hundred eleven thousand, two hundred twenty-five".