8638121 has 2 divisors, whose sum is σ = 8638122. Its totient is φ = 8638120.

The previous prime is 8638117. The next prime is 8638139. The reversal of 8638121 is 1218368.

8638121 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., 8637721 + 400 = 2939^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 8638121 - 2² = 8638117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8638151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4319060 + 4319061.

It is an arithmetic number, because the mean of its divisors is an integer number (4319061).

Almost surely, 2^8638121 is an apocalyptic number.

It is an amenable number.

8638121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8638121 is an equidigital number, since it uses as much as digits as its factorization.

8638121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 8638121 is about 2939.0680495695. The cubic root of 8638121 is about 205.1822373153.

The spelling of 8638121 in words is "eight million, six hundred thirty-eight thousand, one hundred twenty-one".