9888121 has 2 divisors, whose sum is σ = 9888122. Its totient is φ = 9888120.

The previous prime is 9888107. The next prime is 9888127. The reversal of 9888121 is 1218889.

9888121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9369721 + 518400 = 3061^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 9888121 - 2⁵ = 9888089 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (9888127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4944060 + 4944061.

It is an arithmetic number, because the mean of its divisors is an integer number (4944061).

Almost surely, 2^9888121 is an apocalyptic number.

9888121 is the 1816-th hex number.

It is an amenable number.

9888121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9888121 is an equidigital number, since it uses as much as digits as its factorization.

9888121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 37.

The square root of 9888121 is about 3144.5382808928. The cubic root of 9888121 is about 214.6370005921.

The spelling of 9888121 in words is "nine million, eight hundred eighty-eight thousand, one hundred twenty-one".