205249345 has 16 divisors (see below), whose sum is σ = 282245760. Its totient is φ = 140361984.

The previous prime is 205249339. The next prime is 205249349. The reversal of 205249345 is 543942502.

It is not a de Polignac number, because 205249345 - 2⁹ = 205248833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205249345.

It is not an unprimeable number, because it can be changed into a prime (205249349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5529 + ... + 21001.

It is an arithmetic number, because the mean of its divisors is an integer number (17640360).

Almost surely, 2^205249345 is an apocalyptic number.

It is an amenable number.

205249345 is a deficient number, since it is larger than the sum of its proper divisors (76996415).

205249345 is a wasteful number, since it uses less digits than its factorization.

205249345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15864.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 205249345 is about 14326.5259222185. The cubic root of 205249345 is about 589.8758189283.

The spelling of 205249345 in words is "two hundred five million, two hundred forty-nine thousand, three hundred forty-five".