6646249 has 4 divisors (see below), whose sum is σ = 6875460. Its totient is φ = 6417040.

The previous prime is 6646247. The next prime is 6646259. The reversal of 6646249 is 9426466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4700224 + 1946025 = 2168^2 + 1395^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646249 - 2¹ = 6646247 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁵ + 6⁵ + 4⁴ + 6⁷ + 2²¹ + 4¹¹ + 9⁵ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6646247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114562 + ... + 114619.

It is an arithmetic number, because the mean of its divisors is an integer number (1718865).

Almost surely, 2^6646249 is an apocalyptic number.

It is an amenable number.

6646249 is a deficient number, since it is larger than the sum of its proper divisors (229211).

6646249 is a wasteful number, since it uses less digits than its factorization.

6646249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229210.

The product of its digits is 62208, while the sum is 37.

The square root of 6646249 is about 2578.0320013530. The cubic root of 6646249 is about 188.0148716921.

The spelling of 6646249 in words is "six million, six hundred forty-six thousand, two hundred forty-nine".