6539561 has 4 divisors (see below), whose sum is σ = 7473792. Its totient is φ = 5605332.

The previous prime is 6539557. The next prime is 6539579. The reversal of 6539561 is 1659356.

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 6539561 - 2² = 6539557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6539531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467105 + ... + 467118.

It is an arithmetic number, because the mean of its divisors is an integer number (1868448).

Almost surely, 2^6539561 is an apocalyptic number.

It is an amenable number.

6539561 is a deficient number, since it is larger than the sum of its proper divisors (934231).

6539561 is an equidigital number, since it uses as much as digits as its factorization.

6539561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934230.

The product of its digits is 24300, while the sum is 35.

The square root of 6539561 is about 2557.2565377764. The cubic root of 6539561 is about 187.0034124841.

It can be divided in two parts, 65395 and 61, that added together give a palindrome (65456).

The spelling of 6539561 in words is "six million, five hundred thirty-nine thousand, five hundred sixty-one".