216946859 has 4 divisors (see below), whose sum is σ = 217772016. Its totient is φ = 216121704.

The previous prime is 216946853. The next prime is 216946909. The reversal of 216946859 is 958649612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216946859 - 2¹⁶ = 216881323 is a prime.

It is a super-3 number, since 3×216946859³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216946853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412184 + ... + 412709.

It is an arithmetic number, because the mean of its divisors is an integer number (54443004).

Almost surely, 2^216946859 is an apocalyptic number.

216946859 is a deficient number, since it is larger than the sum of its proper divisors (825157).

216946859 is an equidigital number, since it uses as much as digits as its factorization.

216946859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825156.

The product of its digits is 933120, while the sum is 50.

The square root of 216946859 is about 14729.1160291445. The cubic root of 216946859 is about 600.8754433400.

The spelling of 216946859 in words is "two hundred sixteen million, nine hundred forty-six thousand, eight hundred fifty-nine".