205125311 has 8 divisors (see below), whose sum is σ = 216608880. Its totient is φ = 193710528.

The previous prime is 205125301. The next prime is 205125353. The reversal of 205125311 is 113521502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205125311 - 2¹⁰ = 205124287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205125301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11006 + ... + 23051.

It is an arithmetic number, because the mean of its divisors is an integer number (27076110).

Almost surely, 2^205125311 is an apocalyptic number.

205125311 is a deficient number, since it is larger than the sum of its proper divisors (11483569).

205125311 is a wasteful number, since it uses less digits than its factorization.

205125311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34393.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 205125311 is about 14322.1964446798. The cubic root of 205125311 is about 589.7569725884.

Adding to 205125311 its reverse (113521502), we get a palindrome (318646813).

The spelling of 205125311 in words is "two hundred five million, one hundred twenty-five thousand, three hundred eleven".