6540909 has 4 divisors (see below), whose sum is σ = 8721216. Its totient is φ = 4360604.

The previous prime is 6540899. The next prime is 6540913. The reversal of 6540909 is 9090456.

It is a happy number.

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 6540909 - 2⁴ = 6540893 is a prime.

It is a D-number.

6540909 is a modest number, since divided by 909 gives 654 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 6540909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540949) 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, 1090149 + ... + 1090154.

It is an arithmetic number, because the mean of its divisors is an integer number (2180304).

Almost surely, 2^6540909 is an apocalyptic number.

It is an amenable number.

6540909 is a deficient number, since it is larger than the sum of its proper divisors (2180307).

6540909 is a wasteful number, since it uses less digits than its factorization.

6540909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180306.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 6540909 is about 2557.5200878976. The cubic root of 6540909 is about 187.0162606086.

The spelling of 6540909 in words is "six million, five hundred forty thousand, nine hundred nine".