12217091 has 4 divisors (see below), whose sum is σ = 12638400. Its totient is φ = 11795784.

The previous prime is 12217027. The next prime is 12217097. The reversal of 12217091 is 19071221.

12217091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19071221 = 13 ⋅1467017.

It is a cyclic number.

It is not a de Polignac number, because 12217091 - 2⁶ = 12217027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12217097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210611 + ... + 210668.

It is an arithmetic number, because the mean of its divisors is an integer number (3159600).

Almost surely, 2^12217091 is an apocalyptic number.

12217091 is a deficient number, since it is larger than the sum of its proper divisors (421309).

12217091 is an equidigital number, since it uses as much as digits as its factorization.

12217091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421308.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 12217091 is about 3495.2955525964. The cubic root of 12217091 is about 230.3152011089.

The spelling of 12217091 in words is "twelve million, two hundred seventeen thousand, ninety-one".