1224205555 has 8 divisors (see below), whose sum is σ = 1469375712. Its totient is φ = 979145088.

The previous prime is 1224205529. The next prime is 1224205583. The reversal of 1224205555 is 5555024221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1224205555 - 2⁷ = 1224205427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454 + ... + 49483.

It is an arithmetic number, because the mean of its divisors is an integer number (183671964).

Almost surely, 2^1224205555 is an apocalyptic number.

1224205555 is a deficient number, since it is larger than the sum of its proper divisors (245170157).

1224205555 is an equidigital number, since it uses as much as digits as its factorization.

1224205555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54845.

The product of its (nonzero) digits is 20000, while the sum is 31.

The square root of 1224205555 is about 34988.6489450507. The cubic root of 1224205555 is about 1069.7561254550.

Adding to 1224205555 its reverse (5555024221), we get a palindrome (6779229776).

The spelling of 1224205555 in words is "one billion, two hundred twenty-four million, two hundred five thousand, five hundred fifty-five".