209650243 has 4 divisors (see below), whose sum is σ = 228709368. Its totient is φ = 190591120.

The previous prime is 209650213. The next prime is 209650249. The reversal of 209650243 is 342056902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 209650243 - 2⁵ = 209650211 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209650249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9529546 + ... + 9529567.

It is an arithmetic number, because the mean of its divisors is an integer number (57177342).

Almost surely, 2^209650243 is an apocalyptic number.

209650243 is a deficient number, since it is larger than the sum of its proper divisors (19059125).

209650243 is a wasteful number, since it uses less digits than its factorization.

209650243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19059124.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 209650243 is about 14479.3039542652. The cubic root of 209650243 is about 594.0620232862.

The spelling of 209650243 in words is "two hundred nine million, six hundred fifty thousand, two hundred forty-three".