205054909 has 4 divisors (see below), whose sum is σ = 205086400. Its totient is φ = 205023420.

The previous prime is 205054877. The next prime is 205054921. The reversal of 205054909 is 909450502.

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 205054909 - 2⁵ = 205054877 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 (205054939) 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, 1947 + ... + 20344.

It is an arithmetic number, because the mean of its divisors is an integer number (51271600).

Almost surely, 2^205054909 is an apocalyptic number.

It is an amenable number.

205054909 is a deficient number, since it is larger than the sum of its proper divisors (31491).

205054909 is an equidigital number, since it uses as much as digits as its factorization.

205054909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31490.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 205054909 is about 14319.7384403487. The cubic root of 205054909 is about 589.6894938016.

The spelling of 205054909 in words is "two hundred five million, fifty-four thousand, nine hundred nine".