6531945 has 24 divisors (see below), whose sum is σ = 12158784. Its totient is φ = 2985696.

The previous prime is 6531907. The next prime is 6531947. The reversal of 6531945 is 5491356.

It is a happy number.

6531945 is nontrivially palindromic in base 6.

6531945 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 6531945 - 2⁹ = 6531433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6531947) 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 23 ways as a sum of consecutive naturals, for example, 3709 + ... + 5178.

It is an arithmetic number, because the mean of its divisors is an integer number (506616).

Almost surely, 2^6531945 is an apocalyptic number.

It is an amenable number.

6531945 is a deficient number, since it is larger than the sum of its proper divisors (5626839).

6531945 is a wasteful number, since it uses less digits than its factorization.

6531945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8909 (or 8902 counting only the distinct ones).

The product of its digits is 16200, while the sum is 33.

The square root of 6531945 is about 2555.7670081602. The cubic root of 6531945 is about 186.9307892998.

The spelling of 6531945 in words is "six million, five hundred thirty-one thousand, nine hundred forty-five".