6649849 has 2 divisors, whose sum is σ = 6649850. Its totient is φ = 6649848.

The previous prime is 6649837. The next prime is 6649859. The reversal of 6649849 is 9489466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6594624 + 55225 = 2568^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 6649849 - 2⁹ = 6649337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6649799 and 6649808.

It is not a weakly prime, because it can be changed into another prime (6649859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324924 + 3324925.

It is an arithmetic number, because the mean of its divisors is an integer number (3324925).

Almost surely, 2^6649849 is an apocalyptic number.

It is an amenable number.

6649849 is a deficient number, since it is larger than the sum of its proper divisors (1).

6649849 is an equidigital number, since it uses as much as digits as its factorization.

6649849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 46.

The square root of 6649849 is about 2578.7301138351. The cubic root of 6649849 is about 188.0488122084.

The spelling of 6649849 in words is "six million, six hundred forty-nine thousand, eight hundred forty-nine".