216089999 has 8 divisors (see below), whose sum is σ = 220558800. Its totient is φ = 211651200.

The previous prime is 216089989. The next prime is 216090011. The reversal of 216089999 is 999980612.

216089999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 14700²-1.

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-216089999 is a prime.

It is a super-3 number, since 3×216089999³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216089999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216089959) 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, 7352 + ... + 22050.

It is an arithmetic number, because the mean of its divisors is an integer number (27569850).

Almost surely, 2^216089999 is an apocalyptic number.

216089999 is a deficient number, since it is larger than the sum of its proper divisors (4468801).

216089999 is a wasteful number, since it uses less digits than its factorization.

216089999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15001.

The product of its (nonzero) digits is 629856, while the sum is 53.

The square root of 216089999 is about 14699.9999659864. Note that the first 4 decimals coincide. The cubic root of 216089999 is about 600.0833208363.

The spelling of 216089999 in words is "two hundred sixteen million, eighty-nine thousand, nine hundred ninety-nine".