205053217 has 4 divisors (see below), whose sum is σ = 206528560. Its totient is φ = 203577876.

The previous prime is 205053209. The next prime is 205053227. The reversal of 205053217 is 712350502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205053217 - 2³ = 205053209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205053191 and 205053200.

It is not an unprimeable number, because it can be changed into a prime (205053227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 737463 + ... + 737740.

It is an arithmetic number, because the mean of its divisors is an integer number (51632140).

Almost surely, 2^205053217 is an apocalyptic number.

It is an amenable number.

205053217 is a deficient number, since it is larger than the sum of its proper divisors (1475343).

205053217 is a wasteful number, since it uses less digits than its factorization.

205053217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475342.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 205053217 is about 14319.6793609354. The cubic root of 205053217 is about 589.6878718663.

The spelling of 205053217 in words is "two hundred five million, fifty-three thousand, two hundred seventeen".