216023917 has 4 divisors (see below), whose sum is σ = 216173440. Its totient is φ = 215874396.

The previous prime is 216023911. The next prime is 216023921. The reversal of 216023917 is 719320612.

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 a cyclic number.

It is not a de Polignac number, because 216023917 - 2³ = 216023909 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 (216023911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72573 + ... + 75490.

It is an arithmetic number, because the mean of its divisors is an integer number (54043360).

Almost surely, 2^216023917 is an apocalyptic number.

It is an amenable number.

216023917 is a deficient number, since it is larger than the sum of its proper divisors (149523).

216023917 is a wasteful number, since it uses less digits than its factorization.

216023917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149522.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 216023917 is about 14697.7521070400. The cubic root of 216023917 is about 600.0221445531.

The spelling of 216023917 in words is "two hundred sixteen million, twenty-three thousand, nine hundred seventeen".