6505865 has 4 divisors (see below), whose sum is σ = 7807044. Its totient is φ = 5204688.

The previous prime is 6505861. The next prime is 6505867. The reversal of 6505865 is 5685056.

6505865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 2569609 + 3936256 = 1603^2 + 1984^2 .

It is a cyclic number.

It is not a de Polignac number, because 6505865 - 2² = 6505861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6505861) 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, 650582 + ... + 650591.

It is an arithmetic number, because the mean of its divisors is an integer number (1951761).

Almost surely, 2^6505865 is an apocalyptic number.

It is an amenable number.

6505865 is a deficient number, since it is larger than the sum of its proper divisors (1301179).

6505865 is a wasteful number, since it uses less digits than its factorization.

6505865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301178.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 6505865 is about 2550.6597185826. The cubic root of 6505865 is about 186.6816721922.

The spelling of 6505865 in words is "six million, five hundred five thousand, eight hundred sixty-five".