1771225 has 6 divisors (see below), whose sum is σ = 2196350. Its totient is φ = 1416960.

The previous prime is 1771223. The next prime is 1771261. The reversal of 1771225 is 5221771.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 304704 + 1466521 = 552^2 + 1211^2 .

It is not a de Polignac number, because 1771225 - 2¹ = 1771223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 70849 = 1771225 / (1 + 7 + 7 + 1 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1771225.

It is not an unprimeable number, because it can be changed into a prime (1771223) 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 5 ways as a sum of consecutive naturals, for example, 35400 + ... + 35449.

2^1771225 is an apocalyptic number.

It is an amenable number.

1771225 is a deficient number, since it is larger than the sum of its proper divisors (425125).

1771225 is an equidigital number, since it uses as much as digits as its factorization.

1771225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70859 (or 70854 counting only the distinct ones).

The product of its digits is 980, while the sum is 25.

The square root of 1771225 is about 1330.8737731280. The cubic root of 1771225 is about 120.9923497656.

Adding to 1771225 its reverse (5221771), we get a palindrome (6992996).

The spelling of 1771225 in words is "one million, seven hundred seventy-one thousand, two hundred twenty-five".