6541504909 has 4 divisors (see below), whose sum is σ = 6543108000. Its totient is φ = 6539901820.

The previous prime is 6541504901. The next prime is 6541504943. The reversal of 6541504909 is 9094051456.

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 6541504909 - 2³ = 6541504901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541504901) 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, 795409 + ... + 803590.

It is an arithmetic number, because the mean of its divisors is an integer number (1635777000).

Almost surely, 2^6541504909 is an apocalyptic number.

It is an amenable number.

6541504909 is a deficient number, since it is larger than the sum of its proper divisors (1603091).

6541504909 is a wasteful number, since it uses less digits than its factorization.

6541504909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603090.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 6541504909 is about 80879.5704056346. The cubic root of 6541504909 is about 1870.2193980334.

The spelling of 6541504909 in words is "six billion, five hundred forty-one million, five hundred four thousand, nine hundred nine".