1649799771 has 16 divisors (see below), whose sum is σ = 2263861248. Its totient is φ = 1067925600.

The previous prime is 1649799761. The next prime is 1649799787. The reversal of 1649799771 is 1779979461.

It is not a de Polignac number, because 1649799771 - 2⁹ = 1649799259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1649799761) 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 15 ways as a sum of consecutive naturals, for example, 39366 + ... + 69636.

It is an arithmetic number, because the mean of its divisors is an integer number (141491328).

Almost surely, 2^1649799771 is an apocalyptic number.

1649799771 is a deficient number, since it is larger than the sum of its proper divisors (614061477).

1649799771 is a wasteful number, since it uses less digits than its factorization.

1649799771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30802.

The product of its digits is 6001128, while the sum is 60.

The square root of 1649799771 is about 40617.7272997887. The cubic root of 1649799771 is about 1181.6179497962.

The spelling of 1649799771 in words is "one billion, six hundred forty-nine million, seven hundred ninety-nine thousand, seven hundred seventy-one".