194097780089 has 2 divisors, whose sum is σ = 194097780090. Its totient is φ = 194097780088.

The previous prime is 194097780067. The next prime is 194097780133. The reversal of 194097780089 is 980087790491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174563524864 + 19534255225 = 417808^2 + 139765^2 .

It is a cyclic number.

It is not a de Polignac number, because 194097780089 - 2²⁸ = 193829344633 is a prime.

It is not a weakly prime, because it can be changed into another prime (194097780049) 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, 97048890044 + 97048890045.

It is an arithmetic number, because the mean of its divisors is an integer number (97048890045).

Almost surely, 2^194097780089 is an apocalyptic number.

It is an amenable number.

194097780089 is a deficient number, since it is larger than the sum of its proper divisors (1).

194097780089 is an equidigital number, since it uses as much as digits as its factorization.

194097780089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 62.

The spelling of 194097780089 in words is "one hundred ninety-four billion, ninety-seven million, seven hundred eighty thousand, eighty-nine".