194394997 has 2 divisors, whose sum is σ = 194394998. Its totient is φ = 194394996.

The previous prime is 194394989. The next prime is 194395001. The reversal of 194394997 is 799493491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172501956 + 21893041 = 13134^2 + 4679^2 .

It is a cyclic number.

It is not a de Polignac number, because 194394997 - 2³ = 194394989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194394797) 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, 97197498 + 97197499.

It is an arithmetic number, because the mean of its divisors is an integer number (97197499).

Almost surely, 2^194394997 is an apocalyptic number.

It is an amenable number.

194394997 is a deficient number, since it is larger than the sum of its proper divisors (1).

194394997 is an equidigital number, since it uses as much as digits as its factorization.

194394997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 55.

The square root of 194394997 is about 13942.5606328249. The cubic root of 194394997 is about 579.2886612317.

The spelling of 194394997 in words is "one hundred ninety-four million, three hundred ninety-four thousand, nine hundred ninety-seven".