205501005 has 12 divisors (see below), whose sum is σ = 356201820. Its totient is φ = 109600512.

The previous prime is 205501003. The next prime is 205501007. The reversal of 205501005 is 500105502.

It is an interprime number because it is at equal distance from previous prime (205501003) and next prime (205501007).

It can be written as a sum of positive squares in 2 ways, for example, as 157101156 + 48399849 = 12534^2 + 6957^2 .

It is not a de Polignac number, because 205501005 - 2¹ = 205501003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205501003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2283300 + ... + 2283389.

It is an arithmetic number, because the mean of its divisors is an integer number (29683485).

Almost surely, 2^205501005 is an apocalyptic number.

It is an amenable number.

205501005 is a deficient number, since it is larger than the sum of its proper divisors (150700815).

205501005 is a wasteful number, since it uses less digits than its factorization.

205501005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4566700 (or 4566697 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 205501005 is about 14335.3062401889. The cubic root of 205501005 is about 590.1168063287.

Adding to 205501005 its reverse (500105502), we get a palindrome (705606507).

The spelling of 205501005 in words is "two hundred five million, five hundred one thousand, five".