6561379 has 4 divisors (see below), whose sum is σ = 7157880. Its totient is φ = 5964880.

The previous prime is 6561319. The next prime is 6561383. The reversal of 6561379 is 9731656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6561379 - 2⁹ = 6560867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6561319) 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, 298234 + ... + 298255.

It is an arithmetic number, because the mean of its divisors is an integer number (1789470).

Almost surely, 2^6561379 is an apocalyptic number.

6561379 is a deficient number, since it is larger than the sum of its proper divisors (596501).

6561379 is a wasteful number, since it uses less digits than its factorization.

6561379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596500.

The product of its digits is 34020, while the sum is 37.

The square root of 6561379 is about 2561.5188853491. The cubic root of 6561379 is about 187.2111487230.

The spelling of 6561379 in words is "six million, five hundred sixty-one thousand, three hundred seventy-nine".