205044017 has 4 divisors (see below), whose sum is σ = 205250676. Its totient is φ = 204837360.

The previous prime is 205043999. The next prime is 205044019. The reversal of 205044017 is 710440502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 710440502 = 2 ⋅355220251.

It can be written as a sum of positive squares in 2 ways, for example, as 70576801 + 134467216 = 8401^2 + 11596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205044017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205043983 and 205044001.

It is not an unprimeable number, because it can be changed into a prime (205044019) 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, 101834 + ... + 103827.

It is an arithmetic number, because the mean of its divisors is an integer number (51312669).

Almost surely, 2^205044017 is an apocalyptic number.

It is an amenable number.

205044017 is a deficient number, since it is larger than the sum of its proper divisors (206659).

205044017 is an equidigital number, since it uses as much as digits as its factorization.

205044017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206658.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 205044017 is about 14319.3581210891. The cubic root of 205044017 is about 589.6790526768.

Adding to 205044017 its reverse (710440502), we get a palindrome (915484519).

The spelling of 205044017 in words is "two hundred five million, forty-four thousand, seventeen".