6456649 has 4 divisors (see below), whose sum is σ = 6664960. Its totient is φ = 6248340.

The previous prime is 6456641. The next prime is 6456661. The reversal of 6456649 is 9466546.

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 an emirpimes, since its reverse is a distinct semiprime: 9466546 = 2 ⋅4733273.

It is a cyclic number.

It is not a de Polignac number, because 6456649 - 2³ = 6456641 is a prime.

It is a Duffinian number.

6456649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6456641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104109 + ... + 104170.

It is an arithmetic number, because the mean of its divisors is an integer number (1666240).

Almost surely, 2^6456649 is an apocalyptic number.

It is an amenable number.

6456649 is a deficient number, since it is larger than the sum of its proper divisors (208311).

6456649 is a wasteful number, since it uses less digits than its factorization.

6456649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208310.

The product of its digits is 155520, while the sum is 40.

The square root of 6456649 is about 2540.9937032586. The cubic root of 6456649 is about 186.2097395073.

The spelling of 6456649 in words is "six million, four hundred fifty-six thousand, six hundred forty-nine".