1649061309 has 32 divisors (see below), whose sum is σ = 2579399680. Its totient is φ = 917505792.

The previous prime is 1649061301. The next prime is 1649061311. The reversal of 1649061309 is 9031609461.

It is not a de Polignac number, because 1649061309 - 2³ = 1649061301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649061301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301602 + ... + 307020.

It is an arithmetic number, because the mean of its divisors is an integer number (80606240).

Almost surely, 2^1649061309 is an apocalyptic number.

It is an amenable number.

1649061309 is a deficient number, since it is larger than the sum of its proper divisors (930338371).

1649061309 is a wasteful number, since it uses less digits than its factorization.

1649061309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5809.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 1649061309 is about 40608.6358918888. The cubic root of 1649061309 is about 1181.4416233124.

The spelling of 1649061309 in words is "one billion, six hundred forty-nine million, sixty-one thousand, three hundred nine".