1649037899 has 4 divisors (see below), whose sum is σ = 1649775336. Its totient is φ = 1648300464.

The previous prime is 1649037889. The next prime is 1649037959. The reversal of 1649037899 is 9987309461.

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

It is a cyclic number.

It is not a de Polignac number, because 1649037899 - 2¹⁶ = 1648972363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649037809) 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 in 3 ways as a sum of consecutive naturals, for example, 365354 + ... + 369839.

It is an arithmetic number, because the mean of its divisors is an integer number (412443834).

Almost surely, 2^1649037899 is an apocalyptic number.

1649037899 is a deficient number, since it is larger than the sum of its proper divisors (737437).

1649037899 is an equidigital number, since it uses as much as digits as its factorization.

1649037899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737436.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The square root of 1649037899 is about 40608.3476516836. The cubic root of 1649037899 is about 1181.4360327219.

The spelling of 1649037899 in words is "one billion, six hundred forty-nine million, thirty-seven thousand, eight hundred ninety-nine".