205715051 has 4 divisors (see below), whose sum is σ = 206613600. Its totient is φ = 204816504.

The previous prime is 205715021. The next prime is 205715057. The reversal of 205715051 is 150517502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150517502 = 2 ⋅75258751.

It is a cyclic number.

It is not a de Polignac number, because 205715051 - 2⁶ = 205714987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205715051.

It is not an unprimeable number, because it can be changed into a prime (205715057) 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, 448931 + ... + 449388.

It is an arithmetic number, because the mean of its divisors is an integer number (51653400).

Almost surely, 2^205715051 is an apocalyptic number.

205715051 is a deficient number, since it is larger than the sum of its proper divisors (898549).

205715051 is an equidigital number, since it uses as much as digits as its factorization.

205715051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898548.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 205715051 is about 14342.7699904865. The cubic root of 205715051 is about 590.3216201080.

The spelling of 205715051 in words is "two hundred five million, seven hundred fifteen thousand, fifty-one".