6449561 has 4 divisors (see below), whose sum is σ = 6454800. Its totient is φ = 6444324.

The previous prime is 6449537. The next prime is 6449617. The reversal of 6449561 is 1659446.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1659446 = 2 ⋅829723.

It is a cyclic number.

It is not a de Polignac number, because 6449561 - 2¹⁰ = 6448537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6449161) 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, 350 + ... + 3608.

It is an arithmetic number, because the mean of its divisors is an integer number (1613700).

Almost surely, 2^6449561 is an apocalyptic number.

It is an amenable number.

6449561 is a deficient number, since it is larger than the sum of its proper divisors (5239).

6449561 is a wasteful number, since it uses less digits than its factorization.

6449561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5238.

The product of its digits is 25920, while the sum is 35.

The square root of 6449561 is about 2539.5985903288. The cubic root of 6449561 is about 186.1415752578.

The spelling of 6449561 in words is "six million, four hundred forty-nine thousand, five hundred sixty-one".