216232817 has 4 divisors (see below), whose sum is σ = 219897840. Its totient is φ = 212567796.

The previous prime is 216232777. The next prime is 216232859. The reversal of 216232817 is 718232612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216232817 - 2¹⁰ = 216231793 is a prime.

It is a super-2 number, since 2×216232817² = 93513262295510978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216231817) 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, 1832423 + ... + 1832540.

It is an arithmetic number, because the mean of its divisors is an integer number (54974460).

Almost surely, 2^216232817 is an apocalyptic number.

It is an amenable number.

216232817 is a deficient number, since it is larger than the sum of its proper divisors (3665023).

216232817 is an equidigital number, since it uses as much as digits as its factorization.

216232817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665022.

The product of its digits is 8064, while the sum is 32.

The square root of 216232817 is about 14704.8569187191. The cubic root of 216232817 is about 600.2154938910.

The spelling of 216232817 in words is "two hundred sixteen million, two hundred thirty-two thousand, eight hundred seventeen".