216982609 has 8 divisors (see below), whose sum is σ = 224782592. Its totient is φ = 209232720.

The previous prime is 216982463. The next prime is 216982613. The reversal of 216982609 is 906289612.

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

It is a cyclic number.

It is not a de Polignac number, because 216982609 - 2¹⁹ = 216458321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216982639) 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, 3594 + ... + 21139.

It is an arithmetic number, because the mean of its divisors is an integer number (28097824).

Almost surely, 2^216982609 is an apocalyptic number.

It is an amenable number.

216982609 is a deficient number, since it is larger than the sum of its proper divisors (7799983).

216982609 is a wasteful number, since it uses less digits than its factorization.

216982609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25047.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 216982609 is about 14730.3295618258. The cubic root of 216982609 is about 600.9084469941.

The spelling of 216982609 in words is "two hundred sixteen million, nine hundred eighty-two thousand, six hundred nine".