1649149 has 2 divisors, whose sum is σ = 1649150. Its totient is φ = 1649148.

The previous prime is 1649147. The next prime is 1649161. The reversal of 1649149 is 9419461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1643524 + 5625 = 1282^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649149 - 2¹ = 1649147 is a prime.

Together with 1649147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824574 + 824575.

It is an arithmetic number, because the mean of its divisors is an integer number (824575).

2^1649149 is an apocalyptic number.

It is an amenable number.

1649149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649149 is an equidigital number, since it uses as much as digits as its factorization.

1649149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 1649149 is about 1284.1919638434. The cubic root of 1649149 is about 118.1462564511.

The spelling of 1649149 in words is "one million, six hundred forty-nine thousand, one hundred forty-nine".