6649919 has 2 divisors, whose sum is σ = 6649920. Its totient is φ = 6649918.

The previous prime is 6649901. The next prime is 6649999. The reversal of 6649919 is 9199466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6649919 - 2¹² = 6645823 is a prime.

It is a super-2 number, since 2×6649919² = 88442845413122, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6649919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6649999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324959 + 3324960.

It is an arithmetic number, because the mean of its divisors is an integer number (3324960).

Almost surely, 2^6649919 is an apocalyptic number.

6649919 is a deficient number, since it is larger than the sum of its proper divisors (1).

6649919 is an equidigital number, since it uses as much as digits as its factorization.

6649919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 44.

The square root of 6649919 is about 2578.7436863713. The cubic root of 6649919 is about 188.0494720414.

The spelling of 6649919 in words is "six million, six hundred forty-nine thousand, nine hundred nineteen".