205252511 has 4 divisors (see below), whose sum is σ = 205452624. Its totient is φ = 205052400.

The previous prime is 205252501. The next prime is 205252513. The reversal of 205252511 is 115252502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115252502 = 2 ⋅57626251.

It is a cyclic number.

It is not a de Polignac number, because 205252511 - 2²⁶ = 138143647 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 (205252513) 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 3 ways as a sum of consecutive naturals, for example, 98510 + ... + 100571.

It is an arithmetic number, because the mean of its divisors is an integer number (51363156).

Almost surely, 2^205252511 is an apocalyptic number.

205252511 is a deficient number, since it is larger than the sum of its proper divisors (200113).

205252511 is a wasteful number, since it uses less digits than its factorization.

205252511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200112.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 205252511 is about 14326.6364161306. The cubic root of 205252511 is about 589.8788518852.

Subtracting from 205252511 its reverse (115252502), we obtain a palindrome (90000009).

The spelling of 205252511 in words is "two hundred five million, two hundred fifty-two thousand, five hundred eleven".