8100205 has 4 divisors (see below), whose sum is σ = 9720252. Its totient is φ = 6480160.

The previous prime is 8100203. The next prime is 8100217. The reversal of 8100205 is 5020018.

It is a happy number.

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 1643524 + 6456681 = 1282^2 + 2541^2 .

It is not a de Polignac number, because 8100205 - 2¹ = 8100203 is a prime.

It is a super-2 number, since 2×8100205² = 131226642084050, which contains 22 as substring.

It is a Duffinian number.

8100205 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8100203) 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, 810016 + ... + 810025.

It is an arithmetic number, because the mean of its divisors is an integer number (2430063).

Almost surely, 2^8100205 is an apocalyptic number.

It is an amenable number.

8100205 is a deficient number, since it is larger than the sum of its proper divisors (1620047).

8100205 is a wasteful number, since it uses less digits than its factorization.

8100205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620046.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 8100205 is about 2846.0859087526. The cubic root of 8100205 is about 200.8315792542.

The spelling of 8100205 in words is "eight million, one hundred thousand, two hundred five".