205100005 has 16 divisors (see below), whose sum is σ = 269463744. Its totient is φ = 148625280.

The previous prime is 205099987. The next prime is 205100009. The reversal of 205100005 is 500001502.

It is a de Polignac number, because none of the positive numbers 2^k-205100005 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205100009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8977 + ... + 22153.

It is an arithmetic number, because the mean of its divisors is an integer number (16841484).

Almost surely, 2^205100005 is an apocalyptic number.

It is an amenable number.

205100005 is a deficient number, since it is larger than the sum of its proper divisors (64363739).

205100005 is a wasteful number, since it uses less digits than its factorization.

205100005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13476.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 205100005 is about 14321.3129635519. The cubic root of 205100005 is about 589.7327191151.

Adding to 205100005 its reverse (500001502), we get a palindrome (705101507).

The spelling of 205100005 in words is "two hundred five million, one hundred thousand, five".