194899193 has 2 divisors, whose sum is σ = 194899194. Its totient is φ = 194899192.

The previous prime is 194899183. The next prime is 194899253. The reversal of 194899193 is 391998491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133934329 + 60964864 = 11573^2 + 7808^2 .

It is an emirp because it is prime and its reverse (391998491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194899193 - 2²⁰ = 193850617 is a prime.

It is not a weakly prime, because it can be changed into another prime (194899163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97449596 + 97449597.

It is an arithmetic number, because the mean of its divisors is an integer number (97449597).

Almost surely, 2^194899193 is an apocalyptic number.

It is an amenable number.

194899193 is a deficient number, since it is larger than the sum of its proper divisors (1).

194899193 is an equidigital number, since it uses as much as digits as its factorization.

194899193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 53.

The square root of 194899193 is about 13960.6301075560. The cubic root of 194899193 is about 579.7890562665.

It can be divided in two parts, 19489 and 9193, that added together give a palindrome (28682).

The spelling of 194899193 in words is "one hundred ninety-four million, eight hundred ninety-nine thousand, one hundred ninety-three".