9993121 has 2 divisors, whose sum is σ = 9993122. Its totient is φ = 9993120.

The previous prime is 9993119. The next prime is 9993149. The reversal of 9993121 is 1213999.

9993121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8208225 + 1784896 = 2865^2 + 1336^2 .

It is a cyclic number.

It is not a de Polignac number, because 9993121 - 2¹ = 9993119 is a prime.

Together with 9993119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9993821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4996560 + 4996561.

It is an arithmetic number, because the mean of its divisors is an integer number (4996561).

Almost surely, 2^9993121 is an apocalyptic number.

It is an amenable number.

9993121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9993121 is an equidigital number, since it uses as much as digits as its factorization.

9993121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 34.

The square root of 9993121 is about 3161.1898076515. The cubic root of 9993121 is about 215.3940564837.

The spelling of 9993121 in words is "nine million, nine hundred ninety-three thousand, one hundred twenty-one".