194042993 has 2 divisors, whose sum is σ = 194042994. Its totient is φ = 194042992.

The previous prime is 194042987. The next prime is 194043007. The reversal of 194042993 is 399240491.

194042993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163660849 + 30382144 = 12793^2 + 5512^2 .

It is a cyclic number.

It is not a de Polignac number, because 194042993 - 2¹⁸ = 193780849 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 194042993.

It is not a weakly prime, because it can be changed into another prime (194042903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97021496 + 97021497.

It is an arithmetic number, because the mean of its divisors is an integer number (97021497).

Almost surely, 2^194042993 is an apocalyptic number.

It is an amenable number.

194042993 is a deficient number, since it is larger than the sum of its proper divisors (1).

194042993 is an equidigital number, since it uses as much as digits as its factorization.

194042993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 194042993 is about 13929.9315504420. The cubic root of 194042993 is about 578.9387977544.

The spelling of 194042993 in words is "one hundred ninety-four million, forty-two thousand, nine hundred ninety-three".