1217228815 has 16 divisors (see below), whose sum is σ = 1687197600. Its totient is φ = 833182720.

The previous prime is 1217228807. The next prime is 1217228851. The reversal of 1217228815 is 5188227121.

It is not a de Polignac number, because 1217228815 - 2³ = 1217228807 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 649990 + ... + 651859.

It is an arithmetic number, because the mean of its divisors is an integer number (105449850).

Almost surely, 2^1217228815 is an apocalyptic number.

1217228815 is a deficient number, since it is larger than the sum of its proper divisors (469968785).

1217228815 is a wasteful number, since it uses less digits than its factorization.

1217228815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301882.

The product of its digits is 17920, while the sum is 37.

The square root of 1217228815 is about 34888.8064427547. The cubic root of 1217228815 is about 1067.7200748487.

It can be divided in two parts, 1217 and 228815, that added together give a palindrome (230032).

The spelling of 1217228815 in words is "one billion, two hundred seventeen million, two hundred twenty-eight thousand, eight hundred fifteen".