1231225 has 12 divisors (see below), whose sum is σ = 1617084. Its totient is φ = 926720.

The previous prime is 1231207. The next prime is 1231229. The reversal of 1231225 is 5221321.

It can be written as a sum of positive squares in 6 ways, for example, as 56169 + 1175056 = 237^2 + 1084^2 .

It is not a de Polignac number, because 1231225 - 2⁵ = 1231193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231199 and 1231208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231229) 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 11 ways as a sum of consecutive naturals, for example, 1024 + ... + 1873.

It is an arithmetic number, because the mean of its divisors is an integer number (134757).

2^1231225 is an apocalyptic number.

It is an amenable number.

1231225 is a deficient number, since it is larger than the sum of its proper divisors (385859).

1231225 is a wasteful number, since it uses less digits than its factorization.

1231225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924 (or 2919 counting only the distinct ones).

The product of its digits is 120, while the sum is 16.

The square root of 1231225 is about 1109.6057858537. The cubic root of 1231225 is about 107.1796846945.

Adding to 1231225 its reverse (5221321), we get a palindrome (6452546).

The spelling of 1231225 in words is "one million, two hundred thirty-one thousand, two hundred twenty-five".