9121797217 has 48 divisors (see below), whose sum is σ = 10641843520. Its totient is φ = 7767010944.

The previous prime is 9121797211. The next prime is 9121797227. The reversal of 9121797217 is 7127971219.

It is a happy number.

9121797217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9121797217 - 2²³ = 9113408609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9121797211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32232358 + ... + 32232640.

Almost surely, 2^9121797217 is an apocalyptic number.

It is an amenable number.

9121797217 is a deficient number, since it is larger than the sum of its proper divisors (1520046303).

9121797217 is a wasteful number, since it uses less digits than its factorization.

9121797217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 471 counting only the distinct ones).

The product of its digits is 111132, while the sum is 46.

The square root of 9121797217 is about 95508.1002690348. The cubic root of 9121797217 is about 2089.4250852610.

The spelling of 9121797217 in words is "nine billion, one hundred twenty-one million, seven hundred ninety-seven thousand, two hundred seventeen".