217383713 has 4 divisors (see below), whose sum is σ = 218083008. Its totient is φ = 216684420.

The previous prime is 217383679. The next prime is 217383721. The reversal of 217383713 is 317383712.

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 a de Polignac number, because none of the positive numbers 2^k-217383713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217383773) 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, 349181 + ... + 349802.

It is an arithmetic number, because the mean of its divisors is an integer number (54520752).

Almost surely, 2^217383713 is an apocalyptic number.

It is an amenable number.

217383713 is a deficient number, since it is larger than the sum of its proper divisors (699295).

217383713 is an equidigital number, since it uses as much as digits as its factorization.

217383713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699294.

The product of its digits is 21168, while the sum is 35.

The square root of 217383713 is about 14743.9381781124. The cubic root of 217383713 is about 601.2784895798.

Subtracting 217383713 from its reverse (317383712), we obtain a palindrome (99999999).

The spelling of 217383713 in words is "two hundred seventeen million, three hundred eighty-three thousand, seven hundred thirteen".