43649809849 has 4 divisors (see below), whose sum is σ = 43659714420. Its totient is φ = 43639905280.

The previous prime is 43649809829. The next prime is 43649809859. The reversal of 43649809849 is 94890894634.

It is a happy number.

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 1750585600 + 41899224249 = 41840^2 + 204693^2 .

It is a cyclic number.

It is not a de Polignac number, because 43649809849 - 2¹⁵ = 43649777081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43649809829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4945672 + ... + 4954489.

It is an arithmetic number, because the mean of its divisors is an integer number (10914928605).

Almost surely, 2^43649809849 is an apocalyptic number.

It is an amenable number.

43649809849 is a deficient number, since it is larger than the sum of its proper divisors (9904571).

43649809849 is an equidigital number, since it uses as much as digits as its factorization.

43649809849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9904570.

The product of its (nonzero) digits is 53747712, while the sum is 64.

The spelling of 43649809849 in words is "forty-three billion, six hundred forty-nine million, eight hundred nine thousand, eight hundred forty-nine".