205125911 has 4 divisors (see below), whose sum is σ = 210129024. Its totient is φ = 200122800.

The previous prime is 205125827. The next prime is 205125913. The reversal of 205125911 is 119521502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119521502 = 2 ⋅59760751.

It is a cyclic number.

It is not a de Polignac number, because 205125911 - 2²² = 200931607 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 (205125913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501495 + ... + 2501576.

It is an arithmetic number, because the mean of its divisors is an integer number (52532256).

Almost surely, 2^205125911 is an apocalyptic number.

205125911 is a deficient number, since it is larger than the sum of its proper divisors (5003113).

205125911 is an equidigital number, since it uses as much as digits as its factorization.

205125911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5003112.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 205125911 is about 14322.2173911724. The cubic root of 205125911 is about 589.7575476090.

The spelling of 205125911 in words is "two hundred five million, one hundred twenty-five thousand, nine hundred eleven".