216894109 has 8 divisors (see below), whose sum is σ = 229919040. Its totient is φ = 203898816.

The previous prime is 216894091. The next prime is 216894113. The reversal of 216894109 is 901498612.

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

It is not a de Polignac number, because 216894109 - 2⁷ = 216893981 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 (216894149) 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, 8682 + ... + 22564.

It is an arithmetic number, because the mean of its divisors is an integer number (28739880).

Almost surely, 2^216894109 is an apocalyptic number.

It is an amenable number.

216894109 is a deficient number, since it is larger than the sum of its proper divisors (13024931).

216894109 is a wasteful number, since it uses less digits than its factorization.

216894109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14819.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 216894109 is about 14727.3252493452. The cubic root of 216894109 is about 600.8267390181.

The spelling of 216894109 in words is "two hundred sixteen million, eight hundred ninety-four thousand, one hundred nine".