43891497689 has 16 divisors (see below), whose sum is σ = 48700830864. Its totient is φ = 39305088000.

The previous prime is 43891497673. The next prime is 43891497703. The reversal of 43891497689 is 98679419834.

It can be written as a sum of positive squares in 8 ways, for example, as 11662272064 + 32229225625 = 107992^2 + 179525^2 .

It is a cyclic number.

It is not a de Polignac number, because 43891497689 - 2⁴ = 43891497673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43891497619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321212 + ... + 436989.

It is an arithmetic number, because the mean of its divisors is an integer number (3043801929).

Almost surely, 2^43891497689 is an apocalyptic number.

It is an amenable number.

43891497689 is a deficient number, since it is larger than the sum of its proper divisors (4809333175).

43891497689 is a wasteful number, since it uses less digits than its factorization.

43891497689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758348.

The product of its digits is 94058496, while the sum is 68.

The spelling of 43891497689 in words is "forty-three billion, eight hundred ninety-one million, four hundred ninety-seven thousand, six hundred eighty-nine".