9807121 has 4 divisors (see below), whose sum is σ = 9817600. Its totient is φ = 9796644.

The previous prime is 9807107. The next prime is 9807137. The reversal of 9807121 is 1217089.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9807121 - 2⁵ = 9807089 is a prime.

It is an Ulam number.

It is a Duffinian number.

9807121 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9807121.

It is not an unprimeable number, because it can be changed into a prime (9807151) 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, 3681 + ... + 5758.

It is an arithmetic number, because the mean of its divisors is an integer number (2454400).

Almost surely, 2^9807121 is an apocalyptic number.

It is an amenable number.

9807121 is a deficient number, since it is larger than the sum of its proper divisors (10479).

9807121 is a wasteful number, since it uses less digits than its factorization.

9807121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10478.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 9807121 is about 3131.6323219688. The cubic root of 9807121 is about 214.0493160865.

The spelling of 9807121 in words is "nine million, eight hundred seven thousand, one hundred twenty-one".