6817128217 has 4 divisors (see below), whose sum is σ = 7113525120. Its totient is φ = 6520731316.

The previous prime is 6817128203. The next prime is 6817128229. The reversal of 6817128217 is 7128217186.

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 6817128217 - 2¹⁵ = 6817095449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6817108217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148198417 + ... + 148198462.

It is an arithmetic number, because the mean of its divisors is an integer number (1778381280).

Almost surely, 2^6817128217 is an apocalyptic number.

It is an amenable number.

6817128217 is a deficient number, since it is larger than the sum of its proper divisors (296396903).

6817128217 is a wasteful number, since it uses less digits than its factorization.

6817128217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296396902.

The product of its digits is 75264, while the sum is 43.

The square root of 6817128217 is about 82565.9022660081. The cubic root of 6817128217 is about 1896.1258285024.

The spelling of 6817128217 in words is "six billion, eight hundred seventeen million, one hundred twenty-eight thousand, two hundred seventeen".