209653085 has 4 divisors (see below), whose sum is σ = 251583708. Its totient is φ = 167722464.

The previous prime is 209653069. The next prime is 209653091. The reversal of 209653085 is 580356902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 580356902 = 2 ⋅290178451.

It can be written as a sum of positive squares in 2 ways, for example, as 87815641 + 121837444 = 9371^2 + 11038^2 .

It is a cyclic number.

It is not a de Polignac number, because 209653085 - 2⁴ = 209653069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 20965304 + ... + 20965313.

It is an arithmetic number, because the mean of its divisors is an integer number (62895927).

Almost surely, 2^209653085 is an apocalyptic number.

It is an amenable number.

209653085 is a deficient number, since it is larger than the sum of its proper divisors (41930623).

209653085 is an equidigital number, since it uses as much as digits as its factorization.

209653085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41930622.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 209653085 is about 14479.4020940093. The cubic root of 209653085 is about 594.0647076247.

The spelling of 209653085 in words is "two hundred nine million, six hundred fifty-three thousand, eighty-five".