6649481 has 2 divisors, whose sum is σ = 6649482. Its totient is φ = 6649480.

The previous prime is 6649453. The next prime is 6649483. The reversal of 6649481 is 1849466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6330256 + 319225 = 2516^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 6649481 - 2⁶ = 6649417 is a prime.

It is a super-3 number, since 3×6649481³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

Together with 6649483, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6649483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324740 + 3324741.

It is an arithmetic number, because the mean of its divisors is an integer number (3324741).

Almost surely, 2^6649481 is an apocalyptic number.

It is an amenable number.

6649481 is a deficient number, since it is larger than the sum of its proper divisors (1).

6649481 is an equidigital number, since it uses as much as digits as its factorization.

6649481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 6649481 is about 2578.6587598983. The cubic root of 6649481 is about 188.0453432956.

The spelling of 6649481 in words is "six million, six hundred forty-nine thousand, four hundred eighty-one".