1224521 has 4 divisors (see below), whose sum is σ = 1229844. Its totient is φ = 1219200.

The previous prime is 1224481. The next prime is 1224529. The reversal of 1224521 is 1254221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 525625 + 698896 = 725^2 + 836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1224521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1224521.

It is not an unprimeable number, because it can be changed into a prime (1224529) 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 3 ways as a sum of consecutive naturals, for example, 2300 + ... + 2781.

It is an arithmetic number, because the mean of its divisors is an integer number (307461).

2^1224521 is an apocalyptic number.

It is an amenable number.

1224521 is a deficient number, since it is larger than the sum of its proper divisors (5323).

1224521 is an equidigital number, since it uses as much as digits as its factorization.

1224521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5322.

The product of its digits is 160, while the sum is 17.

The square root of 1224521 is about 1106.5807697588. The cubic root of 1224521 is about 106.9848000070.

Adding to 1224521 its reverse (1254221), we get a palindrome (2478742).

The spelling of 1224521 in words is "one million, two hundred twenty-four thousand, five hundred twenty-one".