216216959 has 12 divisors (see below), whose sum is σ = 251763984. Its totient is φ = 185147424.

The previous prime is 216216947. The next prime is 216216983. The reversal of 216216959 is 959612612.

It is not a de Polignac number, because 216216959 - 2¹⁶ = 216151423 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 (216216929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79862 + ... + 82524.

It is an arithmetic number, because the mean of its divisors is an integer number (20980332).

Almost surely, 2^216216959 is an apocalyptic number.

216216959 is a deficient number, since it is larger than the sum of its proper divisors (35547025).

216216959 is a wasteful number, since it uses less digits than its factorization.

216216959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4334 (or 4327 counting only the distinct ones).

The product of its digits is 58320, while the sum is 41.

The square root of 216216959 is about 14704.3176992338. The cubic root of 216216959 is about 600.2008207405.

The spelling of 216216959 in words is "two hundred sixteen million, two hundred sixteen thousand, nine hundred fifty-nine".