216651089 has 8 divisors (see below), whose sum is σ = 218050560. Its totient is φ = 215256096.

The previous prime is 216651049. The next prime is 216651103. The reversal of 216651089 is 980156612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216651089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216651049) 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, 168752 + ... + 170030.

It is an arithmetic number, because the mean of its divisors is an integer number (27256320).

Almost surely, 2^216651089 is an apocalyptic number.

It is an amenable number.

216651089 is a deficient number, since it is larger than the sum of its proper divisors (1399471).

216651089 is a wasteful number, since it uses less digits than its factorization.

216651089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 216651089 is about 14719.0722873420. The cubic root of 216651089 is about 600.6022554635.

The spelling of 216651089 in words is "two hundred sixteen million, six hundred fifty-one thousand, eighty-nine".