216497017 has 4 divisors (see below), whose sum is σ = 236178576. Its totient is φ = 196815460.

The previous prime is 216497009. The next prime is 216497041. The reversal of 216497017 is 710794612.

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 216497017 - 2³ = 216497009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216497417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9840763 + ... + 9840784.

It is an arithmetic number, because the mean of its divisors is an integer number (59044644).

Almost surely, 2^216497017 is an apocalyptic number.

It is an amenable number.

216497017 is a deficient number, since it is larger than the sum of its proper divisors (19681559).

216497017 is a wasteful number, since it uses less digits than its factorization.

216497017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19681558.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 216497017 is about 14713.8376027466. The cubic root of 216497017 is about 600.4598484016.

The spelling of 216497017 in words is "two hundred sixteen million, four hundred ninety-seven thousand, seventeen".