189494609009 has 2 divisors, whose sum is σ = 189494609010. Its totient is φ = 189494609008.

The previous prime is 189494608973. The next prime is 189494609033. The reversal of 189494609009 is 900906494981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113638432609 + 75856176400 = 337103^2 + 275420^2 .

It is an emirp because it is prime and its reverse (900906494981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189494609009 - 2¹⁶ = 189494543473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (189494609069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94747304504 + 94747304505.

It is an arithmetic number, because the mean of its divisors is an integer number (94747304505).

Almost surely, 2^189494609009 is an apocalyptic number.

It is an amenable number.

189494609009 is a deficient number, since it is larger than the sum of its proper divisors (1).

189494609009 is an equidigital number, since it uses as much as digits as its factorization.

189494609009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5038848, while the sum is 59.

The spelling of 189494609009 in words is "one hundred eighty-nine billion, four hundred ninety-four million, six hundred nine thousand, nine".