1648909 has 2 divisors, whose sum is σ = 1648910. Its totient is φ = 1648908.

The previous prime is 1648879. The next prime is 1648919. The reversal of 1648909 is 9098461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1633284 + 15625 = 1278^2 + 125^2 .

It is an emirp because it is prime and its reverse (9098461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1648909 - 2⁷ = 1648781 is a prime.

1648909 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1648919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824454 + 824455.

It is an arithmetic number, because the mean of its divisors is an integer number (824455).

2^1648909 is an apocalyptic number.

It is an amenable number.

1648909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648909 is an equidigital number, since it uses as much as digits as its factorization.

1648909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1648909 is about 1284.0985164698. The cubic root of 1648909 is about 118.1405249138.

The spelling of 1648909 in words is "one million, six hundred forty-eight thousand, nine hundred nine".