1217038009209 has 16 divisors (see below), whose sum is σ = 1782972629760. Its totient is φ = 732292324560.

The previous prime is 1217038009199. The next prime is 1217038009211. The reversal of 1217038009209 is 9029008307121.

It is not a de Polignac number, because 1217038009209 - 2²⁵ = 1217004454777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1217038009249) 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, 132657067 + ... + 132666240.

It is an arithmetic number, because the mean of its divisors is an integer number (111435789360).

Almost surely, 2^{1217038009209} is an apocalyptic number.

It is an amenable number.

1217038009209 is a deficient number, since it is larger than the sum of its proper divisors (565934620551).

1217038009209 is a wasteful number, since it uses less digits than its factorization.

1217038009209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265323460.

The product of its (nonzero) digits is 54432, while the sum is 42.

The spelling of 1217038009209 in words is "one trillion, two hundred seventeen billion, thirty-eight million, nine thousand, two hundred nine".