216617213 has 4 divisors (see below), whose sum is σ = 229359420. Its totient is φ = 203875008.

The previous prime is 216617171. The next prime is 216617221. The reversal of 216617213 is 312716612.

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 185558884 + 31058329 = 13622^2 + 5573^2 .

It is a cyclic number.

It is not a de Polignac number, because 216617213 - 2¹⁴ = 216600829 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 (216617263) 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, 6371078 + ... + 6371111.

It is an arithmetic number, because the mean of its divisors is an integer number (57339855).

Almost surely, 2^216617213 is an apocalyptic number.

It is an amenable number.

216617213 is a deficient number, since it is larger than the sum of its proper divisors (12742207).

216617213 is a wasteful number, since it uses less digits than its factorization.

216617213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12742206.

The product of its digits is 3024, while the sum is 29.

The square root of 216617213 is about 14717.9214904823. The cubic root of 216617213 is about 600.5709500396.

The spelling of 216617213 in words is "two hundred sixteen million, six hundred seventeen thousand, two hundred thirteen".