217053609 has 8 divisors (see below), whose sum is σ = 290059872. Its totient is φ = 144374880.

The previous prime is 217053563. The next prime is 217053611. The reversal of 217053609 is 906350712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 217053609 - 2⁷ = 217053481 is a prime.

It is a super-2 number, since 2×217053609² = 94224538359849762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 217053609.

It is not an unprimeable number, because it can be changed into a prime (217053649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80332 + ... + 82989.

It is an arithmetic number, because the mean of its divisors is an integer number (36257484).

Almost surely, 2^217053609 is an apocalyptic number.

It is an amenable number.

217053609 is a deficient number, since it is larger than the sum of its proper divisors (73006263).

217053609 is a wasteful number, since it uses less digits than its factorization.

217053609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163767.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 217053609 is about 14732.7393583135. The cubic root of 217053609 is about 600.9739819653.

The spelling of 217053609 in words is "two hundred seventeen million, fifty-three thousand, six hundred nine".