6531009 has 16 divisors (see below), whose sum is σ = 9342720. Its totient is φ = 4043520.

The previous prime is 6530999. The next prime is 6531029. The reversal of 6531009 is 9001356.

6531009 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6531009 - 2⁸ = 6530753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6531009.

It is not an unprimeable number, because it can be changed into a prime (6531029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3219 + ... + 4839.

It is an arithmetic number, because the mean of its divisors is an integer number (583920).

Almost surely, 2^6531009 is an apocalyptic number.

It is an amenable number.

6531009 is a deficient number, since it is larger than the sum of its proper divisors (2811711).

6531009 is a wasteful number, since it uses less digits than its factorization.

6531009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 6531009 is about 2555.5838863164. The cubic root of 6531009 is about 186.9218600770.

The spelling of 6531009 in words is "six million, five hundred thirty-one thousand, nine".