205502051 has 2 divisors, whose sum is σ = 205502052. Its totient is φ = 205502050.

The previous prime is 205502027. The next prime is 205502053. The reversal of 205502051 is 150205502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205502051 - 2¹⁸ = 205239907 is a prime.

Together with 205502053, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205502053) 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, 102751025 + 102751026.

It is an arithmetic number, because the mean of its divisors is an integer number (102751026).

Almost surely, 2^205502051 is an apocalyptic number.

205502051 is a deficient number, since it is larger than the sum of its proper divisors (1).

205502051 is an equidigital number, since it uses as much as digits as its factorization.

205502051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 205502051 is about 14335.3427234929. The cubic root of 205502051 is about 590.1178075584.

Adding to 205502051 its reverse (150205502), we get a palindrome (355707553).

The spelling of 205502051 in words is "two hundred five million, five hundred two thousand, fifty-one".