16648909 has 2 divisors, whose sum is σ = 16648910. Its totient is φ = 16648908.

The previous prime is 16648901. The next prime is 16648949. The reversal of 16648909 is 90984661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15015625 + 1633284 = 3875^2 + 1278^2 .

It is a cyclic number.

It is not a de Polignac number, because 16648909 - 2³ = 16648901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16648901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8324454 + 8324455.

It is an arithmetic number, because the mean of its divisors is an integer number (8324455).

Almost surely, 2^16648909 is an apocalyptic number.

It is an amenable number.

16648909 is a deficient number, since it is larger than the sum of its proper divisors (1).

16648909 is an equidigital number, since it uses as much as digits as its factorization.

16648909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 16648909 is about 4080.3074639051. The cubic root of 16648909 is about 255.3457261098.

The spelling of 16648909 in words is "sixteen million, six hundred forty-eight thousand, nine hundred nine".