43721649889529 has 2 divisors, whose sum is σ = 43721649889530. Its totient is φ = 43721649889528.

The previous prime is 43721649889523. The next prime is 43721649889601. The reversal of 43721649889529 is 92598894612734.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43258875813904 + 462774075625 = 6577148^2 + 680275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43721649889529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43721649889529.

It is not a weakly prime, because it can be changed into another prime (43721649889523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21860824944764 + 21860824944765.

It is an arithmetic number, because the mean of its divisors is an integer number (21860824944765).

Almost surely, 2^{43721649889529} is an apocalyptic number.

It is an amenable number.

43721649889529 is a deficient number, since it is larger than the sum of its proper divisors (1).

43721649889529 is an equidigital number, since it uses as much as digits as its factorization.

43721649889529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1881169920, while the sum is 77.

The spelling of 43721649889529 in words is "forty-three trillion, seven hundred twenty-one billion, six hundred forty-nine million, eight hundred eighty-nine thousand, five hundred twenty-nine".