205249351 has 2 divisors, whose sum is σ = 205249352. Its totient is φ = 205249350.

The previous prime is 205249349. The next prime is 205249391. The reversal of 205249351 is 153942502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205249351 - 2¹ = 205249349 is a prime.

Together with 205249349, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205249301) 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, 102624675 + 102624676.

It is an arithmetic number, because the mean of its divisors is an integer number (102624676).

Almost surely, 2^205249351 is an apocalyptic number.

205249351 is a deficient number, since it is larger than the sum of its proper divisors (1).

205249351 is an equidigital number, since it uses as much as digits as its factorization.

205249351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 205249351 is about 14326.5261316203. The cubic root of 205249351 is about 589.8758246762.

The spelling of 205249351 in words is "two hundred five million, two hundred forty-nine thousand, three hundred fifty-one".