1224651 has 4 divisors (see below), whose sum is σ = 1632872. Its totient is φ = 816432.

The previous prime is 1224637. The next prime is 1224673. The reversal of 1224651 is 1564221.

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

It is not a de Polignac number, because 1224651 - 2¹¹ = 1222603 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1224851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204106 + ... + 204111.

It is an arithmetic number, because the mean of its divisors is an integer number (408218).

2^1224651 is an apocalyptic number.

1224651 is a deficient number, since it is larger than the sum of its proper divisors (408221).

1224651 is an equidigital number, since it uses as much as digits as its factorization.

1224651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408220.

The product of its digits is 480, while the sum is 21.

The square root of 1224651 is about 1106.6395076989. The cubic root of 1224651 is about 106.9885858497.

Adding to 1224651 its reverse (1564221), we get a palindrome (2788872).

The spelling of 1224651 in words is "one million, two hundred twenty-four thousand, six hundred fifty-one".