9819121 has 4 divisors (see below), whose sum is σ = 10574452. Its totient is φ = 9063792.

The previous prime is 9819101. The next prime is 9819127. The reversal of 9819121 is 1219189.

9819121 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 4579600 + 5239521 = 2140^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 9819121 - 2¹⁹ = 9294833 is a prime.

It is a Duffinian number.

9819121 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9819127) 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, 377646 + ... + 377671.

It is an arithmetic number, because the mean of its divisors is an integer number (2643613).

Almost surely, 2^9819121 is an apocalyptic number.

It is an amenable number.

9819121 is a deficient number, since it is larger than the sum of its proper divisors (755331).

9819121 is a wasteful number, since it uses less digits than its factorization.

9819121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755330.

The product of its digits is 1296, while the sum is 31.

The square root of 9819121 is about 3133.5476699741. The cubic root of 9819121 is about 214.1365841325.

The spelling of 9819121 in words is "nine million, eight hundred nineteen thousand, one hundred twenty-one".