216233509 has 8 divisors (see below), whose sum is σ = 230358240. Its totient is φ = 202383216.

The previous prime is 216233503. The next prime is 216233531. The reversal of 216233509 is 905332612.

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

It is not a de Polignac number, because 216233509 - 2¹¹ = 216231461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216233503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66982 + ... + 70135.

It is an arithmetic number, because the mean of its divisors is an integer number (28794780).

Almost surely, 2^216233509 is an apocalyptic number.

It is an amenable number.

216233509 is a deficient number, since it is larger than the sum of its proper divisors (14124731).

216233509 is a wasteful number, since it uses less digits than its factorization.

216233509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137219.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 216233509 is about 14704.8804483410. The cubic root of 216233509 is about 600.2161341711.

The spelling of 216233509 in words is "two hundred sixteen million, two hundred thirty-three thousand, five hundred nine".