6649281 has 12 divisors (see below), whose sum is σ = 9748752. Its totient is φ = 4366296.

The previous prime is 6649273. The next prime is 6649289. The reversal of 6649281 is 1829466.

6649281 is a `hidden beast` number, since 6 + 649 + 2 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (6649273) and next prime (6649289).

It is not a de Polignac number, because 6649281 - 2³ = 6649273 is a prime.

It is a super-2 number, since 2×6649281² = 88425875633922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6649289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4911 + ... + 6116.

It is an arithmetic number, because the mean of its divisors is an integer number (812396).

Almost surely, 2^6649281 is an apocalyptic number.

It is an amenable number.

6649281 is a deficient number, since it is larger than the sum of its proper divisors (3099471).

6649281 is a wasteful number, since it uses less digits than its factorization.

6649281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11100 (or 11097 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 6649281 is about 2578.6199797566. The cubic root of 6649281 is about 188.0434579632.

The spelling of 6649281 in words is "six million, six hundred forty-nine thousand, two hundred eighty-one".