205510051 has 2 divisors, whose sum is σ = 205510052. Its totient is φ = 205510050.

The previous prime is 205510021. The next prime is 205510057. The reversal of 205510051 is 150015502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205510051 - 2⁹ = 205509539 is a prime.

It is not a weakly prime, because it can be changed into another prime (205510057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102755025 + 102755026.

It is an arithmetic number, because the mean of its divisors is an integer number (102755026).

Almost surely, 2^205510051 is an apocalyptic number.

205510051 is a deficient number, since it is larger than the sum of its proper divisors (1).

205510051 is an equidigital number, since it uses as much as digits as its factorization.

205510051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 205510051 is about 14335.6217514275. The cubic root of 205510051 is about 590.1254650346.

Adding to 205510051 its reverse (150015502), we get a palindrome (355525553).

The spelling of 205510051 in words is "two hundred five million, five hundred ten thousand, fifty-one".