1228217515 has 16 divisors (see below), whose sum is σ = 1685331648. Its totient is φ = 841746816.

The previous prime is 1228217491. The next prime is 1228217519. The reversal of 1228217515 is 5157128221.

It is a cyclic number.

It is not a de Polignac number, because 1228217515 - 2⁷ = 1228217387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1228217519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63309 + ... + 80401.

It is an arithmetic number, because the mean of its divisors is an integer number (105333228).

Almost surely, 2^1228217515 is an apocalyptic number.

1228217515 is a deficient number, since it is larger than the sum of its proper divisors (457114133).

1228217515 is a wasteful number, since it uses less digits than its factorization.

1228217515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19158.

The product of its digits is 11200, while the sum is 34.

The square root of 1228217515 is about 35045.9343576398. The cubic root of 1228217515 is about 1070.9234509121.

The spelling of 1228217515 in words is "one billion, two hundred twenty-eight million, two hundred seventeen thousand, five hundred fifteen".