43194473989 has 2 divisors, whose sum is σ = 43194473990. Its totient is φ = 43194473988.

The previous prime is 43194473941. The next prime is 43194474047. The reversal of 43194473989 is 98937449134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34144757089 + 9049716900 = 184783^2 + 95130^2 .

It is a cyclic number.

It is not a de Polignac number, because 43194473989 - 2¹¹ = 43194471941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43194473489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21597236994 + 21597236995.

It is an arithmetic number, because the mean of its divisors is an integer number (21597236995).

Almost surely, 2^43194473989 is an apocalyptic number.

It is an amenable number.

43194473989 is a deficient number, since it is larger than the sum of its proper divisors (1).

43194473989 is an equidigital number, since it uses as much as digits as its factorization.

43194473989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 61.

The spelling of 43194473989 in words is "forty-three billion, one hundred ninety-four million, four hundred seventy-three thousand, nine hundred eighty-nine".