194535217 has 2 divisors, whose sum is σ = 194535218. Its totient is φ = 194535216.

The previous prime is 194535203. The next prime is 194535247. The reversal of 194535217 is 712535491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187115041 + 7420176 = 13679^2 + 2724^2 .

It is an emirp because it is prime and its reverse (712535491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194535217 is a prime.

It is not a weakly prime, because it can be changed into another prime (194535247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97267608 + 97267609.

It is an arithmetic number, because the mean of its divisors is an integer number (97267609).

Almost surely, 2^194535217 is an apocalyptic number.

It is an amenable number.

194535217 is a deficient number, since it is larger than the sum of its proper divisors (1).

194535217 is an equidigital number, since it uses as much as digits as its factorization.

194535217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 37.

The square root of 194535217 is about 13947.5882144549. The cubic root of 194535217 is about 579.4279109292.

The spelling of 194535217 in words is "one hundred ninety-four million, five hundred thirty-five thousand, two hundred seventeen".