1648530385 has 4 divisors (see below), whose sum is σ = 1978236468. Its totient is φ = 1318824304.

The previous prime is 1648530371. The next prime is 1648530397. The reversal of 1648530385 is 5830358461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 798458049 + 850072336 = 28257^2 + 29156^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648530385 - 2⁵ = 1648530353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 164853034 + ... + 164853043.

It is an arithmetic number, because the mean of its divisors is an integer number (494559117).

Almost surely, 2^1648530385 is an apocalyptic number.

It is an amenable number.

1648530385 is a deficient number, since it is larger than the sum of its proper divisors (329706083).

1648530385 is an equidigital number, since it uses as much as digits as its factorization.

1648530385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329706082.

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 1648530385 is about 40602.0982832168. The cubic root of 1648530385 is about 1181.3148192457.

The spelling of 1648530385 in words is "one billion, six hundred forty-eight million, five hundred thirty thousand, three hundred eighty-five".