6726561 has 4 divisors (see below), whose sum is σ = 8968752. Its totient is φ = 4484372.

The previous prime is 6726547. The next prime is 6726571. The reversal of 6726561 is 1656276.

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 6726561 - 2⁵ = 6726529 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6726571) 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, 1121091 + ... + 1121096.

It is an arithmetic number, because the mean of its divisors is an integer number (2242188).

Almost surely, 2^6726561 is an apocalyptic number.

It is an amenable number.

6726561 is a deficient number, since it is larger than the sum of its proper divisors (2242191).

6726561 is a wasteful number, since it uses less digits than its factorization.

6726561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242190.

The product of its digits is 15120, while the sum is 33.

The square root of 6726561 is about 2593.5614509782. The cubic root of 6726561 is about 188.7691535027.

The spelling of 6726561 in words is "six million, seven hundred twenty-six thousand, five hundred sixty-one".