209535066 has 32 divisors (see below), whose sum is σ = 501453120. Its totient is φ = 64472112.

The previous prime is 209535049. The next prime is 209535089. The reversal of 209535066 is 660535902.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 209535066.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 148540 + ... + 149943.

It is an arithmetic number, because the mean of its divisors is an integer number (15670410).

Almost surely, 2^209535066 is an apocalyptic number.

209535066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

209535066 is an abundant number, since it is smaller than the sum of its proper divisors (291918054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209535066 is a wasteful number, since it uses less digits than its factorization.

209535066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298507 (or 298501 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 209535066 is about 14475.3261103161. The cubic root of 209535066 is about 593.9532153745.

The spelling of 209535066 in words is "two hundred nine million, five hundred thirty-five thousand, sixty-six".