205404051 has 4 divisors (see below), whose sum is σ = 273872072. Its totient is φ = 136936032.

The previous prime is 205404037. The next prime is 205404103. The reversal of 205404051 is 150404502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 205404051 - 2⁶ = 205403987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205404011) 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, 34234006 + ... + 34234011.

It is an arithmetic number, because the mean of its divisors is an integer number (68468018).

Almost surely, 2^205404051 is an apocalyptic number.

205404051 is a deficient number, since it is larger than the sum of its proper divisors (68468021).

205404051 is an equidigital number, since it uses as much as digits as its factorization.

205404051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68468020.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 205404051 is about 14331.9241904219. The cubic root of 205404051 is about 590.0239873423.

Adding to 205404051 its reverse (150404502), we get a palindrome (355808553).

The spelling of 205404051 in words is "two hundred five million, four hundred four thousand, fifty-one".