6511081 has 4 divisors (see below), whose sum is σ = 6544000. Its totient is φ = 6478164.

The previous prime is 6511073. The next prime is 6511111. The reversal of 6511081 is 1801156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6511081 - 2³ = 6511073 is a prime.

It is a super-3 number, since 3×6511081³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6511031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16161 + ... + 16558.

It is an arithmetic number, because the mean of its divisors is an integer number (1636000).

Almost surely, 2^6511081 is an apocalyptic number.

It is an amenable number.

6511081 is a deficient number, since it is larger than the sum of its proper divisors (32919).

6511081 is a wasteful number, since it uses less digits than its factorization.

6511081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32918.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 6511081 is about 2551.6819942932. The cubic root of 6511081 is about 186.7315488032.

The spelling of 6511081 in words is "six million, five hundred eleven thousand, eighty-one".