8205121 has 2 divisors, whose sum is σ = 8205122. Its totient is φ = 8205120.

The previous prime is 8205103. The next prime is 8205137. The reversal of 8205121 is 1215028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4730625 + 3474496 = 2175^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 8205121 - 2¹¹ = 8203073 is a prime.

It is not a weakly prime, because it can be changed into another prime (8205191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4102560 + 4102561.

It is an arithmetic number, because the mean of its divisors is an integer number (4102561).

Almost surely, 2^8205121 is an apocalyptic number.

It is an amenable number.

8205121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8205121 is an equidigital number, since it uses as much as digits as its factorization.

8205121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 8205121 is about 2864.4582384807. The cubic root of 8205121 is about 201.6949370320.

The spelling of 8205121 in words is "eight million, two hundred five thousand, one hundred twenty-one".