9121797215 has 8 divisors (see below), whose sum is σ = 10951500768. Its totient is φ = 7293875040.

The previous prime is 9121797211. The next prime is 9121797227. The reversal of 9121797215 is 5127971219.

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

It is not a de Polignac number, because 9121797215 - 2² = 9121797211 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434051 + ... + 454580.

It is an arithmetic number, because the mean of its divisors is an integer number (1368937596).

Almost surely, 2^9121797215 is an apocalyptic number.

9121797215 is a deficient number, since it is larger than the sum of its proper divisors (1829703553).

9121797215 is a wasteful number, since it uses less digits than its factorization.

9121797215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890689.

The product of its digits is 79380, while the sum is 44.

The square root of 9121797215 is about 95508.1002585645. The cubic root of 9121797215 is about 2089.4250851083.

The spelling of 9121797215 in words is "nine billion, one hundred twenty-one million, seven hundred ninety-seven thousand, two hundred fifteen".