6542521 has 4 divisors (see below), whose sum is σ = 6556032. Its totient is φ = 6529012.

The previous prime is 6542513. The next prime is 6542527. The reversal of 6542521 is 1252456.

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 6542521 - 2³ = 6542513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6542527) 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, 6001 + ... + 7006.

It is an arithmetic number, because the mean of its divisors is an integer number (1639008).

Almost surely, 2^6542521 is an apocalyptic number.

It is an amenable number.

6542521 is a deficient number, since it is larger than the sum of its proper divisors (13511).

6542521 is a wasteful number, since it uses less digits than its factorization.

6542521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13510.

The product of its digits is 2400, while the sum is 25.

The square root of 6542521 is about 2557.8352175228. The cubic root of 6542521 is about 187.0316226655.

Adding to 6542521 its reverse (1252456), we get a palindrome (7794977).

The spelling of 6542521 in words is "six million, five hundred forty-two thousand, five hundred twenty-one".