6517985 has 4 divisors (see below), whose sum is σ = 7821588. Its totient is φ = 5214384.

The previous prime is 6517981. The next prime is 6517997. The reversal of 6517985 is 5897156.

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 4255969 + 2262016 = 2063^2 + 1504^2 .

It is a cyclic number.

It is not a de Polignac number, because 6517985 - 2² = 6517981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6517981) 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, 651794 + ... + 651803.

It is an arithmetic number, because the mean of its divisors is an integer number (1955397).

Almost surely, 2^6517985 is an apocalyptic number.

It is an amenable number.

6517985 is a deficient number, since it is larger than the sum of its proper divisors (1303603).

6517985 is a wasteful number, since it uses less digits than its factorization.

6517985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303602.

The product of its digits is 75600, while the sum is 41.

The square root of 6517985 is about 2553.0344690192. The cubic root of 6517985 is about 186.7975255187.

The spelling of 6517985 in words is "six million, five hundred seventeen thousand, nine hundred eighty-five".