1521225 has 18 divisors (see below), whose sum is σ = 2725086. Its totient is φ = 811200.

The previous prime is 1521217. The next prime is 1521227. The reversal of 1521225 is 5221251.

It can be written as a sum of positive squares in 3 ways, for example, as 242064 + 1279161 = 492^2 + 1131^2 .

It is not a de Polignac number, because 1521225 - 2³ = 1521217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1521198 and 1521207.

It is not an unprimeable number, because it can be changed into a prime (1521227) 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 17 ways as a sum of consecutive naturals, for example, 3156 + ... + 3605.

2^1521225 is an apocalyptic number.

1521225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1521225 is a deficient number, since it is larger than the sum of its proper divisors (1203861).

1521225 is a wasteful number, since it uses less digits than its factorization.

1521225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6777 (or 6769 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 1521225 is about 1233.3795036403. The cubic root of 1521225 is about 115.0088209995.

Adding to 1521225 its reverse (5221251), we get a palindrome (6742476).

It can be divided in two parts, 1521 and 225, that multiplied together give a square (342225 = 585²).

The spelling of 1521225 in words is "one million, five hundred twenty-one thousand, two hundred twenty-five".