194173430987 has 2 divisors, whose sum is σ = 194173430988. Its totient is φ = 194173430986.

The previous prime is 194173430933. The next prime is 194173431013. The reversal of 194173430987 is 789034371491.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194173430987 - 2²⁴ = 194156653771 is a prime.

It is not a weakly prime, because it can be changed into another prime (194173430287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97086715493 + 97086715494.

It is an arithmetic number, because the mean of its divisors is an integer number (97086715494).

Almost surely, 2^194173430987 is an apocalyptic number.

194173430987 is a deficient number, since it is larger than the sum of its proper divisors (1).

194173430987 is an equidigital number, since it uses as much as digits as its factorization.

194173430987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 194173430987 in words is "one hundred ninety-four billion, one hundred seventy-three million, four hundred thirty thousand, nine hundred eighty-seven".