6384649217 has 4 divisors (see below), whose sum is σ = 6760216836. Its totient is φ = 6009081600.

The previous prime is 6384649199. The next prime is 6384649259. The reversal of 6384649217 is 7129464836.

It is a Cunningham number, because it is equal to 79904²+1.

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 4970814016 + 1413835201 = 70504^2 + 37601^2 .

It is a cyclic number.

It is not a de Polignac number, because 6384649217 - 2¹² = 6384645121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6384649267) 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, 187783784 + ... + 187783817.

It is an arithmetic number, because the mean of its divisors is an integer number (1690054209).

Almost surely, 2^6384649217 is an apocalyptic number.

It is an amenable number.

6384649217 is a deficient number, since it is larger than the sum of its proper divisors (375567619).

6384649217 is a wasteful number, since it uses less digits than its factorization.

6384649217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375567618.

The product of its digits is 1741824, while the sum is 50.

The square root of 6384649217 is about 79904.0000062575. Note that the first 5 decimals coincide. The cubic root of 6384649217 is about 1855.1499278950.

The spelling of 6384649217 in words is "six billion, three hundred eighty-four million, six hundred forty-nine thousand, two hundred seventeen".