6509985 has 16 divisors (see below), whose sum is σ = 10659264. Its totient is φ = 3390912.

The previous prime is 6509977. The next prime is 6510011. The reversal of 6509985 is 5899056.

It is not a de Polignac number, because 6509985 - 2³ = 6509977 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4402 + ... + 5691.

It is an arithmetic number, because the mean of its divisors is an integer number (666204).

Almost surely, 2^6509985 is an apocalyptic number.

It is an amenable number.

6509985 is a deficient number, since it is larger than the sum of its proper divisors (4149279).

6509985 is a wasteful number, since it uses less digits than its factorization.

6509985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10144.

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 6509985 is about 2551.4672249512. The cubic root of 6509985 is about 186.7210708062.

The spelling of 6509985 in words is "six million, five hundred nine thousand, nine hundred eighty-five".