8209121 has 4 divisors (see below), whose sum is σ = 8641200. Its totient is φ = 7777044.

The previous prime is 8209109. The next prime is 8209129. The reversal of 8209121 is 1219028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8209121 - 2²² = 4014817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8209129) 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, 216011 + ... + 216048.

It is an arithmetic number, because the mean of its divisors is an integer number (2160300).

Almost surely, 2^8209121 is an apocalyptic number.

It is an amenable number.

8209121 is a deficient number, since it is larger than the sum of its proper divisors (432079).

8209121 is a wasteful number, since it uses less digits than its factorization.

8209121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432078.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 8209121 is about 2865.1563657155. The cubic root of 8209121 is about 201.7277071635.

The spelling of 8209121 in words is "eight million, two hundred nine thousand, one hundred twenty-one".