43430450721209 has 2 divisors, whose sum is σ = 43430450721210. Its totient is φ = 43430450721208.

The previous prime is 43430450721191. The next prime is 43430450721241. The reversal of 43430450721209 is 90212705403434.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29650170368809 + 13780280352400 = 5445197^2 + 3712180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43430450721209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43430450721209.

It is not a weakly prime, because it can be changed into another prime (43430450729209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21715225360604 + 21715225360605.

It is an arithmetic number, because the mean of its divisors is an integer number (21715225360605).

Almost surely, 2^{43430450721209} is an apocalyptic number.

It is an amenable number.

43430450721209 is a deficient number, since it is larger than the sum of its proper divisors (1).

43430450721209 is an equidigital number, since it uses as much as digits as its factorization.

43430450721209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 44.

The spelling of 43430450721209 in words is "forty-three trillion, four hundred thirty billion, four hundred fifty million, seven hundred twenty-one thousand, two hundred nine".