43571328649 has 6 divisors (see below), whose sum is σ = 44780760654. Its totient is φ = 42393723840.

The previous prime is 43571328641. The next prime is 43571328677. The reversal of 43571328649 is 94682317534.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 34135149049 + 9436179600 = 184757^2 + 97140^2 .

It is not a de Polignac number, because 43571328649 - 2³ = 43571328641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43571328596 and 43571328605.

It is not an unprimeable number, because it can be changed into a prime (43571328641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15912192 + ... + 15914929.

It is an arithmetic number, because the mean of its divisors is an integer number (7463460109).

Almost surely, 2^43571328649 is an apocalyptic number.

It is an amenable number.

43571328649 is a deficient number, since it is larger than the sum of its proper divisors (1209432005).

43571328649 is an equidigital number, since it uses as much as digits as its factorization.

43571328649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31827195 (or 31827158 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The spelling of 43571328649 in words is "forty-three billion, five hundred seventy-one million, three hundred twenty-eight thousand, six hundred forty-nine".