216351109 has 8 divisors (see below), whose sum is σ = 233132760. Its totient is φ = 199589376.

The previous prime is 216351101. The next prime is 216351131. The reversal of 216351109 is 901153612.

It can be written as a sum of positive squares in 4 ways, for example, as 18948609 + 197402500 = 4353^2 + 14050^2 .

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 216351109 - 2³ = 216351101 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 (216351101) 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, 23769 + ... + 31585.

It is an arithmetic number, because the mean of its divisors is an integer number (29141595).

Almost surely, 2^216351109 is an apocalyptic number.

It is an amenable number.

216351109 is a deficient number, since it is larger than the sum of its proper divisors (16781651).

216351109 is a wasteful number, since it uses less digits than its factorization.

216351109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9959.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 216351109 is about 14708.8785772403. The cubic root of 216351109 is about 600.3249249338.

The spelling of 216351109 in words is "two hundred sixteen million, three hundred fifty-one thousand, one hundred nine".