43490873218409 has 2 divisors, whose sum is σ = 43490873218410. Its totient is φ = 43490873218408.

The previous prime is 43490873218391. The next prime is 43490873218421. The reversal of 43490873218409 is 90481237809434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41222460702784 + 2268412515625 = 6420472^2 + 1506125^2 .

It is a cyclic number.

It is not a de Polignac number, because 43490873218409 - 2⁸ = 43490873218153 is a prime.

It is not a weakly prime, because it can be changed into another prime (43490873218109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21745436609204 + 21745436609205.

It is an arithmetic number, because the mean of its divisors is an integer number (21745436609205).

Almost surely, 2^{43490873218409} is an apocalyptic number.

It is an amenable number.

43490873218409 is a deficient number, since it is larger than the sum of its proper divisors (1).

43490873218409 is an equidigital number, since it uses as much as digits as its factorization.

43490873218409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41803776, while the sum is 62.

The spelling of 43490873218409 in words is "forty-three trillion, four hundred ninety billion, eight hundred seventy-three million, two hundred eighteen thousand, four hundred nine".