6511965 has 32 divisors (see below), whose sum is σ = 11153280. Its totient is φ = 3234816.

The previous prime is 6511961. The next prime is 6511997. The reversal of 6511965 is 5691156.

6511965 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6511965 - 2² = 6511961 is a prime.

It is a super-2 number, since 2×6511965² = 84811376322450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6511961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20649 + ... + 20961.

It is an arithmetic number, because the mean of its divisors is an integer number (348540).

Almost surely, 2^6511965 is an apocalyptic number.

It is an amenable number.

6511965 is a deficient number, since it is larger than the sum of its proper divisors (4641315).

6511965 is a wasteful number, since it uses less digits than its factorization.

6511965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its digits is 8100, while the sum is 33.

The square root of 6511965 is about 2551.8552074912. The cubic root of 6511965 is about 186.7399991777.

The spelling of 6511965 in words is "six million, five hundred eleven thousand, nine hundred sixty-five".