216530417 has 4 divisors (see below), whose sum is σ = 216637440. Its totient is φ = 216423396.

The previous prime is 216530359. The next prime is 216530449. The reversal of 216530417 is 714035612.

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 216530417 - 2¹⁴ = 216514033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216530417.

It is not an unprimeable number, because it can be changed into a prime (216530117) 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, 50417 + ... + 54542.

It is an arithmetic number, because the mean of its divisors is an integer number (54159360).

Almost surely, 2^216530417 is an apocalyptic number.

It is an amenable number.

216530417 is a deficient number, since it is larger than the sum of its proper divisors (107023).

216530417 is a wasteful number, since it uses less digits than its factorization.

216530417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107022.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 216530417 is about 14714.9725449965. The cubic root of 216530417 is about 600.4907253901.

The spelling of 216530417 in words is "two hundred sixteen million, five hundred thirty thousand, four hundred seventeen".