9121209 has 8 divisors (see below), whose sum is σ = 12282432. Its totient is φ = 6020400.

The previous prime is 9121207. The next prime is 9121213. The reversal of 9121209 is 9021219.

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

It is not a de Polignac number, because 9121209 - 2¹ = 9121207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9121207) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14749 + ... + 15354.

It is an arithmetic number, because the mean of its divisors is an integer number (1535304).

Almost surely, 2^9121209 is an apocalyptic number.

It is an amenable number.

9121209 is a deficient number, since it is larger than the sum of its proper divisors (3161223).

9121209 is a wasteful number, since it uses less digits than its factorization.

9121209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30207.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 9121209 is about 3020.1339374273. The cubic root of 9121209 is about 208.9380172263.

The spelling of 9121209 in words is "nine million, one hundred twenty-one thousand, two hundred nine".