216552517 has 4 divisors (see below), whose sum is σ = 216680940. Its totient is φ = 216424096.

The previous prime is 216552503. The next prime is 216552559. The reversal of 216552517 is 715255612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 124411716 + 92140801 = 11154^2 + 9599^2 .

It is a cyclic number.

It is not a de Polignac number, because 216552517 - 2¹⁹ = 216028229 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 (216552587) 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, 61648 + ... + 65065.

It is an arithmetic number, because the mean of its divisors is an integer number (54170235).

Almost surely, 2^216552517 is an apocalyptic number.

It is an amenable number.

216552517 is a deficient number, since it is larger than the sum of its proper divisors (128423).

216552517 is a wasteful number, since it uses less digits than its factorization.

216552517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128422.

The product of its digits is 21000, while the sum is 34.

The square root of 216552517 is about 14715.7234616583. The cubic root of 216552517 is about 600.5111542267.

The spelling of 216552517 in words is "two hundred sixteen million, five hundred fifty-two thousand, five hundred seventeen".