1251225 has 36 divisors (see below), whose sum is σ = 2301936. Its totient is φ = 649440.

The previous prime is 1251179. The next prime is 1251227. The reversal of 1251225 is 5221521.

It is not a de Polignac number, because 1251225 - 2⁶ = 1251161 is a prime.

It is an Ulam number.

1251225 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1251198 and 1251207.

It is not an unprimeable number, because it can be changed into a prime (1251227) 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 35 ways as a sum of consecutive naturals, for example, 15034 + ... + 15116.

2^1251225 is an apocalyptic number.

1251225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251225 is a deficient number, since it is larger than the sum of its proper divisors (1050711).

1251225 is a wasteful number, since it uses less digits than its factorization.

1251225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 158 counting only the distinct ones).

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

The square root of 1251225 is about 1118.5816912501. The cubic root of 1251225 is about 107.7569121127.

Adding to 1251225 its reverse (5221521), we get a palindrome (6472746).

The spelling of 1251225 in words is "one million, two hundred fifty-one thousand, two hundred twenty-five".