205250813 has 2 divisors, whose sum is σ = 205250814. Its totient is φ = 205250812.

The previous prime is 205250807. The next prime is 205250831. The reversal of 205250813 is 318052502.

Together with next prime (205250831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110733529 + 94517284 = 10523^2 + 9722^2 .

It is a cyclic number.

It is not a de Polignac number, because 205250813 - 2¹⁴ = 205234429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205250113) 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, 102625406 + 102625407.

It is an arithmetic number, because the mean of its divisors is an integer number (102625407).

Almost surely, 2^205250813 is an apocalyptic number.

It is an amenable number.

205250813 is a deficient number, since it is larger than the sum of its proper divisors (1).

205250813 is an equidigital number, since it uses as much as digits as its factorization.

205250813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 205250813 is about 14326.5771557619. The cubic root of 205250813 is about 589.8772252432.

The spelling of 205250813 in words is "two hundred five million, two hundred fifty thousand, eight hundred thirteen".